Database Develop

[Q] Xperia Z possible brick

After searching around I couldn't find anything related so here's my problem.
After succesfully unlocking the bootloader of my Xperia Z it continues to work fine.
It prompted the initial startup screen (enter language, account info ect.)
I turned my device off and on... this is where the problem starts..
This is what i get
Sony brand logo>
Xperia brand logo>
5 repeated cloud animation of xperia logo and at the last one it stalls, Phone reboot and back to 0.
This goes on repeatedly until a hard poweroff or complete discharge ( I suppose)
So I know im kinda screwed, is relocking the bootloader any option? Contacting Sony atm for some sort of software replacement/flash anything..
Cheers, Geert

Try the safe mode,keep pressing vol down with power until the phone boot completely.
If the phone boot to safe mode than do a factory reset.
Sent from my C6602 using xda premium

GeertNool said:
After searching around I couldn't find anything related so here's my problem.
After succesfully unlocking the bootloader of my Xperia Z it continues to work fine.
It prompted the initial startup screen (enter language, account info ect.)
I turned my device off and on... this is where the problem starts..
This is what i get
Sony brand logo>
Xperia brand logo>
5 repeated cloud animation of xperia logo and at the last one it stalls, Phone reboot and back to 0.
This goes on repeatedly until a hard poweroff or complete discharge ( I suppose)
So I know im kinda screwed, is relocking the bootloader any option? Contacting Sony atm for some sort of software replacement/flash anything..
Cheers, Geert
Click to expand...
Click to collapse
Welcome to XDA
you should go to the recovery thread in my signature. Read the first 2 posts.
Hope you recover your phone.

Hi everyone !
I have the same problem as GeertNool. My Xperia is stuck in the same loop. I have tried everything.
- Flashboot : stuck at 0% when i try to flash
- Pc Companion and SEUS = dead ends
- Safe mode : cant make it work
I read the recovery thread. It seems that the Kernel is malfunctioning but i dont understand what should be my next move. Am i supposed to let the phone reboot endlessly untill eventually the battery dies ?
Thanks a lot for your precious answers.
Alex

al3xwhite said:
Hi everyone !
I have the same problem as GeertNool. My Xperia is stuck in the same loop. I have tried everything.
- Flashboot : stuck at 0% when i try to flash
- Pc Companion and SEUS = dead ends
- Safe mode : cant make it work
I read the recovery thread. It seems that the Kernel is malfunctioning but i dont understand what should be my next move. Am i supposed to let the phone reboot endlessly untill eventually the battery dies ?
Thanks a lot for your precious answers.
Alex
Click to expand...
Click to collapse
Yes.
When the battery dies the phone should reset itself.
After the loops end plug into a charger, not pc for now.
You should get a red led indicating low battery level charging is working.
After the red led you may get Sony boot screen or bootloops.
If you get Sony and then the charging battery icon, then charge to over 50%. Then use pc companion or flashtool to restore.
If you get bootloops then read my 2nd post from the recovery thread in my signature for bootloop tricks.
Please let me know if it works. I am looking to add the Xperia Z to my recovery guide.
If there are any questions about my guide please ask in that thread.
Thanks
From Jaramie's LT28at

Try this: hold power and VolUp for about 15 seconds. The device should vibrate 3 times in a row. It should now be off. Don't plug it in anywhere.
Download the correct flashtool beta for xperia z http://forum.xda-developers.com/showthread.php?t=2162907
Download a known-to-work firmware ftf
Put it into C:\Flashtool\Firmwares
Open flashtool (flashtool64 if you run 64bit Windows)
Chose Flash (flash arrow button)
Chose the ftf you downloaded
Enable "Wipe: Data, Cache, Appslog"
Click flash
A new window opens with a "press back button" animation
Now plug in the device while ONLY holding VolDown. Only VolDown, no Power. The LED should turn green.
Don't interrupt the flashing process. It will take a while.
Report back if it worked.

after flashing rom my xperia is booting until the lock screen appears then it resets. what should i do? thanks

vaud27 said:
after flashing rom my xperia is booting until the lock screen appears then it resets. what should i do? thanks
Click to expand...
Click to collapse
Did you flash it with flashtool?
Did you enabled "Wipe: Data, Cache, Appslog.?
Sent from my C6602 using xda premium

gm007 said:
Did you flash it with flashtool?
Did you enabled "Wipe: Data, Cache, Appslog.?
Sent from my C6602 using xda premium
Click to expand...
Click to collapse
i use cwm to flash it. i wipe everything. after flashing the recovery disappear and my xperia keeps on rebooting after reaching the lock screen.
can i reflash it using flashtool even my usb debugging is off?

vaud27 said:
i use cwm to flash it. i wipe everything. after flashing the recovery disappear and my xperia keeps on rebooting after reaching the lock screen.
can i reflash it using flashtool even my usb debugging is off?
Click to expand...
Click to collapse
Something wrong with the rom you are trying to install.
Yes you can use flashtool even if usb debugging is off.
Check schaggo post up^^^^
Sent from my C6602 using xda premium

gm007 said:
Something wrong with the rom you are trying to install.
Yes you can use flashtool even if usb debugging is off.
Sent from my C6602 using xda premium
Click to expand...
Click to collapse
i will try to flash it using flashtool. thanks for your help mate

had the same problem and i managed to fix it just showing sony sign by installing the sony update programme on the sony update website
all you do is put phone into flashboot mode.
on mine i had to hold up and power button untill it vibrates 3 times then press down volume button to get it into flashboot mode
takes a few atempts but it worked.
takes around 20 mins to download then install another 10.
i couldnt get flashtool to flash firmware as my phone is locked on 3 mobile firmware locked bootloader
i hope this helps you

update:
schaggo method works. i can breath now. thanks to @gm007

This worked great for unbricking mine !!
P.S. don't waste time for Sony's Emma flash, they do not send login credentials in real time, site says they do manual user validation ...
schaggo said:
Try this: hold power and VolUp for about 15 seconds. The device should vibrate 3 times in a row. It should now be off. Don't plug it in anywhere.
Download the correct flashtool beta for xperia z http://forum.xda-developers.com/showthread.php?t=2162907
Download a known-to-work firmware ftf
Put it into C:\Flashtool\Firmwares
Open flashtool (flashtool64 if you run 64bit Windows)
Chose Flash (flash arrow button)
Chose the ftf you downloaded
Enable "Wipe: Data, Cache, Appslog"
Click flash
A new window opens with a "press back button" animation
Now plug in the device while ONLY holding VolDown. Only VolDown, no Power. The LED should turn green.
Don't interrupt the flashing process. It will take a while.
Report back if it worked.
Click to expand...
Click to collapse

AW: [Q] Xperia Z possible brick
racht said:
...don't waste time for Sony's Emma flash, they do not send login credentials in real time...
Click to expand...
Click to collapse
They never will. Read the instructions which come with EMMA. I have it working fine, officially, without any credentials.

flashtool not flash the phone
schaggo said:
Try this: hold power and VolUp for about 15 seconds. The device should vibrate 3 times in a row. It should now be off. Don't plug it in anywhere.
Download the correct flashtool beta for xperia z http://forum.xda-developers.com/showthread.php?t=2162907
Download a known-to-work firmware ftf
Put it into C:\Flashtool\Firmwares
Open flashtool (flashtool64 if you run 64bit Windows)
Chose Flash (flash arrow button)
Chose the ftf you downloaded
Enable "Wipe: Data, Cache, Appslog"
Click flash
A new window opens with a "press back button" animation
Now plug in the device while ONLY holding VolDown. Only VolDown, no Power. The LED should turn green.
Don't interrupt the flashing process. It will take a while.
Report back if it worked.
Click to expand...
Click to collapse
I have the same issue here, the phone suddenly dead. Charge it using AC adaptor and wall socket and the red led flashs for about 2 hours, the orange LED never turns on. Try your advice and got this:
1) Vol up + Power not work (no vibration, nothing)
2) Flash with flashtool 0.9.10.2 beta6 with no lucky, indicated "device disconnected" after animation gone.
3) regress to flashtool 0.9.10.1, device connected and then stuck at "flashing data.....", the progress bar stay at 0% and then nothing.
P.S. bootloader is still locked but phone is ROOTED so I'm affraid it's out of warranty. Just got the phone as a birthday gift from my wife yesterday! She'd kill me if she knows that.
Update:
1) Power + Vol Up works now. The sequence does matter, I found I have to press the Power button first and then Vol Up, it dosen't work vise versa.
2) flashing still doesn't work for me. And I noticed that the LED turn green and then turn off immediately. I'm not sure if that is the cause. I'm sure when in fastboot mode (connect to USB port when pressing Vol Up), the LED turn blue and stay blue. Is my flash mode corrupted?? That's really bad!

[email protected] said:
I have the same issue here, the phone suddenly dead. Charge it using AC adaptor and wall socket and the red led flashs for about 2 hours, the orange LED never turns on. Try your advice and got this:
1) Vol up + Power not work (no vibration, nothing)
2) Flash with flashtool 0.9.10.2 beta6 with no lucky, indicated "device disconnected" after animation gone.
3) regress to flashtool 0.9.10.1, device connected and then stuck at "flashing data.....", the progress bar stay at 0% and then nothing.
P.S. bootloader is still locked but phone is ROOTED so I'm affraid it's out of warranty. Just got the phone as a birthday gift from my wife yesterday! She'd kill me if she knows that.
Update:
1) Power + Vol Up works now. The sequence does matter, I found I have to press the Power button first and then Vol Up, it dosen't work vise versa.
2) flashing still doesn't work for me. And I noticed that the LED turn green and then turn off immediately. I'm not sure if that is the cause. I'm sure when in fastboot mode (connect to USB port when pressing Vol Up), the LED turn blue and stay blue. Is my flash mode corrupted?? That's really bad!
Click to expand...
Click to collapse
Try sony update service or remove flashtool and install again and use another firmware(maybe the first one is corrupted).
Sent from my C6603 using xda premium

[email protected] said:
P.S. bootloader is still locked but phone is ROOTED so I'm affraid it's out of warranty. Just got the phone as a birthday gift from my wife yesterday! She'd kill me if she knows that.
Update:
1) Power + Vol Up works now. The sequence does matter, I found I have to press the Power button first and then Vol Up, it dosen't work vise versa.
2) flashing still doesn't work for me. And I noticed that the LED turn green and then turn off immediately. I'm not sure if that is the cause. I'm sure when in fastboot mode (connect to USB port when pressing Vol Up), the LED turn blue and stay blue. Is my flash mode corrupted?? That's really bad!
Click to expand...
Click to collapse
It probably means your battery was low.
From my Xperia LT28at ION

gm007 said:
Try sony update service or remove flashtool and install again and use another firmware(maybe the first one is corrupted).
Sent from my C6603 using xda premium
Click to expand...
Click to collapse
Thanks for response. Finally flashtool 0.9.10.1b works for me!

Returning to stock
Hey guys,
I've flashed [ROM][JB 4.2.2][CM10.1][AOKP-MR1][PananoidAndroid 3.15] PAC v22.1.1 - Update: 0508 from http://forum.xda-developers.com/showthread.php?t=2208249&page=65. It's working, but I'd like to try another ROM, specifically Xperia Z Revolution™ from http://forum.xda-developers.com/showthread.php?t=2175903. This requires to install stock 10.1.A.1.434 firstly So I downloaded C6603_10.1.A.1.434_Generic DE, NL, world. Flashing with Flashtools 0.9.10.1 always stucks at 0%.
BL unlocked. Does anyone have any idea how to get stock 434 in the phone? Originally there were older one 10.1.A.1.340, if it's somehow important to know...

[Q] Stuck on Htc Logo and can not power off

Hi Everyone;
I unlocked my phone for flashing custom rom. After unlocking i reebooted it and was normal. Then i flashed cwm via htc one toolkit. It was successfull as well. Then i go to cwm and made factory reset + wipe cache + dalvik cache. Then i go to install zip from sd card but i could not find my rom file. Thought, it was deleted while unlocking device. Then decided to reboot phone again to copy rom file into the phone and reboot.
But, when i rebooted phone from cwm, it stuck on HTC Logo( Quietly Brilliant screen). Waited sometime, but nothing happened. Then i tried to power off it and boot into bootloader or recovery. I press and hold power button but it does not respond anyhow. When i am holding power button ,back and home buttons are blinking but nothing happens. Almost five minutes i waited as holding down power button but phone does not power off anyhow. i tried all methods like vol down + power, vol up + power and both volume keys + power. But really nothing happens, just blinking back and home buttons. That's all.
I can not simply power off device. :crying:
I also tried boot device via fastboot commands but it says "waiting for device" means computer does not recognize device.
Guys, i need an urgent help. Please...

just keep trying to reboot via holding power or power+vol down. if it doesnt reboot after 30 sec or so let go then try again. if that doesnt work you will have to wait for the battery to die. once you get to bootloader use all in one toolkit to erace cache. then boot to recovery and you rom should be there if not boot back to bootloader and sideload rom

skinsfanbdh said:
just keep trying to reboot via holding power or power+vol down. if it doesnt reboot after 30 sec or so let go then try again. if that doesnt work you will have to wait for the battery to die. once you get to bootloader use all in one toolkit to erace cache. then boot to recovery and you rom should be there if not boot back to bootloader and sideload rom
Click to expand...
Click to collapse
just keep trying to reboot via holding power or power+vol down. if it doesnt reboot after 30 sec or so let go then try again. if that doesnt work you will have to wait for the battery to die. once you get to bootloader use all in one toolkit to erace cache. then boot to recovery and you rom should be there if not boot back to bootloader and sideload rom
Click to expand...
Click to collapse
First thank you for your quick reply. Unfortunatelly, power+vol down does not work at all. Maybe i tried 50 times.
Anyhow, after battery die. How can i boot into bootloader. I mean, can phone be charged again in this situation? Also, even if i manage to boot into bootloader or recovery how can i put custom rom file into phone. Actually, i did not use sideload or whatever you mentioned before.
I am serouisly confused now and don't know what to do.
Anyhow, as you said, firlst i need wait to battery die i think. Then i will report back whats happen.
Thank you again btw.

Blue_Shine said:
First thank you for your quick reply. Unfortunatelly, power+vol down does not work at all. Maybe i tried 50 times.
Anyhow, after battery die. How can i boot into bootloader. I mean, can phone be charged again in this situation? Also, even if i manage to boot into bootloader or recovery how can i put custom rom file into phone. Actually, i did not use sideload or whatever you mentioned before.
I am serouisly confused now and don't know what to do.
Anyhow, as you said, firlst i need wait to battery die i think. Then i will report back whats happen.
Thank you again btw.
Click to expand...
Click to collapse
yes your not the first person with this problem. hold power+vol down to get into bootloader. press power button in bootloader to get in fast boot mode. use all in one toolkit to erase cache and side load rom. i recommend all in one toolkit because it automates the process. just select the option then follow on screen steps

Good to hear that i am not the first person That means somehow there is a solution i beleive. Still waiting for battery die. even i had 50 percent battery at the begining but still it holds on I never say again htc battery is bad
I exeprienced that stucking on boot logo several times before with my other htc phones but holding power + vol down/up worked always. This is the first time for me that i faced with power button can not power off device.. Well, ,i hope i wish i can handle out this problem. Definetley with your help.
Regards,

I am having the same problem and don't know what to do :crying:
Today I just got my One. Unlocked bootloader, rooted, flashed Android Revolution rom. Everything worked fine for a while... I wanted to reinstall the rom because I wanted to change some options in the installer - I did not wipe because it was the same rom (big mistake I guess!!). After making the installation option changes, when it was done it proceeded to reboot but now I am stuck in a white HTC logo boot loop hell... (with the red text at the bottom that says "this build is for development purposes only" etc). Holy crap I never had a phone that I could not remove the battery. I cannot get this back into recovery or ANYTHING, it just keeps looping... computer recognizes it, no problem with drivers or anything it just doesn't stay connected long enough (because of the constant looping) to be able to use the toolkit.
PLEASE any advice?? Can't even shut it down omg. Do I have a $600 brick here? :crying::crying:

Deeva said:
I am having the same problem and don't know what to do :crying:
Today I just got my One. Unlocked bootloader, rooted, flashed Android Revolution rom. Everything worked fine for a while... I wanted to reinstall the rom because I wanted to change some options in the installer - I did not wipe because it was the same rom (big mistake I guess!!). After making the installation option changes, when it was done it proceeded to reboot but now I am stuck in a white HTC logo boot loop hell... (with the red text at the bottom that says "this build is for development purposes only" etc). Holy crap I never had a phone that I could not remove the battery. I cannot get this back into recovery or ANYTHING, it just keeps looping... computer recognizes it, no problem with drivers or anything it just doesn't stay connected long enough (because of the constant looping) to be able to use the toolkit.
PLEASE any advice?? Can't even shut it down omg. Do I have a $600 brick here? :crying::crying:
Click to expand...
Click to collapse
Did you read the other posts in this thread? The way you do a "battery pull" on this phone is to HOLD the PWR + VOL DOWN button for ~15seconds. Your capactivie buttons will blink, too. On my device, it took exactly 15seconds to reboot. There have been some reports of some phones that get so stuck that you just have to wait until the battery dies and charge it back up.
Alternatively, if the computer is recongizing it, try to adb reboot recovery to try and get into the recovery.

Deeva said:
I am having the same problem and don't know what to do :crying:
Today I just got my One. Unlocked bootloader, rooted, flashed Android Revolution rom. Everything worked fine for a while... I wanted to reinstall the rom because I wanted to change some options in the installer - I did not wipe because it was the same rom (big mistake I guess!!). After making the installation option changes, when it was done it proceeded to reboot but now I am stuck in a white HTC logo boot loop hell... (with the red text at the bottom that says "this build is for development purposes only" etc). Holy crap I never had a phone that I could not remove the battery. I cannot get this back into recovery or ANYTHING, it just keeps looping... computer recognizes it, no problem with drivers or anything it just doesn't stay connected long enough (because of the constant looping) to be able to use the toolkit.
PLEASE any advice?? Can't even shut it down omg. Do I have a $600 brick here? :crying::crying:
Click to expand...
Click to collapse
no. if it turns on you should be ok. try holdind power+vol down to get into bootloader then try toolkit if it just stays on waiting for device press power button to get into fastboot mode from bootloader

skinsfanbdh said:
yes your not the first person with this problem. hold power+vol down to get into bootloader. press power button in bootloader to get in fast boot mode. use all in one toolkit to erase cache and side load rom. i recommend all in one toolkit because it automates the process. just select the option then follow on screen steps
Click to expand...
Click to collapse
hi again. this morning my battery finally out. Then i put my phone to the charger and started it in fastboot mode( that is a good new) Then i left it for 20-30 minutes to charge a little bit for flashing custom rom.Then i went to recovery and started adb sideload. Sideload was succesful and finally came to aroma installer of trickdroid. I chose my installation options and started to flash rom but process was frozen on 10 percent. It was saying unmount system, unmount cahce and both of them has notification as "already unmounted". But installation was not going on. Then again i tried to go back fasboot mode again by press and holding power+vol down but unfortunatelly lights are blinking but nothing happens again. I think i need to wait to battery die again.
Isn't it quite weird? Why power+vol down combination does not work for me anytime? So, do i need to wait for battery die in every frozen? Do you have any ideas or comments ?
Do i need to go back to stock first ?
EDIT : Battery was out again and i tried once more. This time installation (trick droid) was successful but it frozen at the end this time. And unfortunatelly i can not restart (power+vol down) it again again Holy crap, i am really pissed off with this problem.

O..K...Finally, i managed to start my phone and now it works... Especially thank you skinsfanbdh for your support.
But still i don't know how to solve button configuration problem. But anyhow i think i won't need quite sometim to use it I hope someone can find a solution for that later.

Guide me with steps please
Blue_Shine said:
O..K...Finally, i managed to start my phone and now it works... Especially thank you skinsfanbdh for your support.
But still i don't know how to solve button configuration problem. But anyhow i think i won't need quite sometim to use it I hope someone can find a solution for that later.
Click to expand...
Click to collapse
Hi, I have the same problem now and I let my phone die but when I put it to charge and try to go in bootloader, it's doesn't go and gets stuck at the logo again.
Would you please guide me with the steps how u fixed your phone?

Blue_Shine said:
O..K...Finally, i managed to start my phone and now it works... Especially thank you skinsfanbdh for your support.
But still i don't know how to solve button configuration problem. But anyhow i think i won't need quite sometim to use it I hope someone can find a solution for that later.
Click to expand...
Click to collapse
Do u fix it,i have same problem.on Zenfone max.after successfully rom installation i reboot my phone thn it stuck on resurrection remix logo,then i go into recovery,and mount the stock image without wiping.then twrp showed that image installation successful.thn i reboot it in recovery but it stuck on asus logo.what can i do right now?

Fix it
skinsfanbdh said:
no. if it turns on you should be ok. try holdind power+vol down to get into bootloader then try toolkit if it just stays on waiting for device press power button to get into fastboot mode from bootloader
Click to expand...
Click to collapse
Today i fixed it via asus flash tool.with the right steps it can be flash to stock with no problem

What should I do if I can't even get to the boot screen? I tried holding down the power and volume up buttons, but it just restarts and goes back to the same HTC load screen, what do I do????

Accidently Flashed Doom kernel I Bricked my Sony Xperia TL LT30at

I accidentally flashed the doom kernel that I forgot to delete off of my phone when trying to flash something else now my phone won't turn on. When I try to power it on it just vibrates and when I try to boot into recovery it just vibrates 3 times. Every now and then I can get the led to light up when it's being charged and I'm holding the power button. But still doesn't power on fully.

Try to flash stock ftf or another kernel via flashtool.
Sent from my Xperia V using Tapatalk now Free

mjb1567 said:
I accidentally flashed the doom kernel that I forgot to delete off of my phone when trying to flash something else now my phone won't turn on. When I try to power it on it just vibrates and when I try to boot into recovery it just vibrates 3 times. Every now and then I can get the led to light up when it's being charged and I'm holding the power button. But still doesn't power on fully.
Click to expand...
Click to collapse
you try to flash a different kernel is not considered

mjb1567 said:
I accidentally flashed the doom kernel that I forgot to delete off of my phone when trying to flash something else now my phone won't turn on. When I try to power it on it just vibrates and when I try to boot into recovery it just vibrates 3 times. Every now and then I can get the led to light up when it's being charged and I'm holding the power button. But still doesn't power on fully.
Click to expand...
Click to collapse
Actually, if all you flashed was a wrong kernel, then you don't need to reflash a whole ftf with flashtool, given your bootloader is unlocked. Only flash the correct kernel in fastboot mode:
Unplug und plug in the USB-cable. Hold Vol+ and the ON-button at the same time for a couple seconds until you feel a single vibration. Let go of the ON-button but keep the Vol+ pressed. You should be in fastboot mode again indicated by the blue LED.
If that works, you can reflash the original kernel.elf or boot.img with fastboot in order to get the phone working again. That way you won't loose any data.

i've just done the same thing
mjb1567 said:
I accidentally flashed the doom kernel that I forgot to delete off of my phone when trying to flash something else now my phone won't turn on. When I try to power it on it just vibrates and when I try to boot into recovery it just vibrates 3 times. Every now and then I can get the led to light up when it's being charged and I'm holding the power button. But still doesn't power on fully.
Click to expand...
Click to collapse
did you fix it?

Hold Vol+ and connect the usb cable that is the right way of Fastboot mode. The Flashtool mode is HOLD Vol- and connect the cable.

Lt30at bootloader isn't unlockable. So I think you should flash stock kernel only.
Sent from my LT30at using Tapatalk

I didn't think it would even flash to brick because the boot loader wouldn't allow it to even write there, so is it even booting into recovery or flashmode?
KitKat slo"g" slide

Weird Softbrick

So I installed a TWRP RECOVERY a Motorola RAZR i, using the Flash Tool.
It installed but I could never access it from the POWER VOLUME UP & DOWN method.
So I had to turn the phone on and enable USB Debugging then use ADB to reboot into recovery via the Flash Tool.
Then I was working on a PORT when I flashed a ROM, it went into bootflop, now I cannot get into the BOOTLOADER at all.
It never works, it will show the normal warning sign and then just go straight to the ROM.
I tried using RSD with an SBF File but it did not work, as I have to be in fastboot and I cannot be in without going into the bootloader.
Is there no hope for this device...

I have the feeling that twrp isn't flashed right. U did use fastboot?
For the bootloop. Hold volume down the whole time when it boots/bootloops, it will boot in ap flashmode (fastboot). Maybe u need to stop pressing the button after the first restart(when holding the volume down button) at the moment u get the warning.
Easily recoverable, just need some trying with the above way.
Sent from my XT890 using xda app-developers app

My method to come into fastboot-mode while having a bootloop:
1. when in bootloop press all buttons (power, VolUp, VolDown) and keep pressed
2. when screen goes off, leave the VolUp button alone, keep VolDown and Power pressed.
3. when phone vibrates, leave power alone and keep VolDown pressed
4. the bl-unlock-warning shows up and after a few seconds you should be in fastboot-mode
5. now you can leave VolDown alone
Maybe you need some tries, cause its a question of timing, but for me it works.

Thanks...
@icual
I am very grateful for your help. Thank You ever so much. The solution worked perfectly. You saved my phone

[Q] Bricked Xperia c6603 that can't shut down

So the thing is, I decided to buy this phone from another person a few days ago while it was still working but it had this one problem where the owner told me about how the phone can't be shutdown unless the battery runs out of power. Any time you shut it down, it simply reboots instead. I thought it was most likely a problem I could fix after flashing, so I decided to buy it.
Using Flashtool I was able to see that if timed pressing the buttons and plugging it into my computer right before the reboot started, I could boot into flashmode. This phone came in the 4.4 KK firmware and the 10.5.1.A.0.292 Generic NCB build, so I flashed an older kernel and rooted it using Towelroot before reflashing the 10.5.1.A.0.292 Generic NCB kernal. After rooting (and testing if root apps can shut it down which didn't work either), with a locked bootloader I installed the XZDualRecovery using the method here because I was finding it so hard to unlock the bootloader and Flashtool wouldn't do it either. It automatically booted into TWRP recovery menu but when I tried to flash a ROM (existenz Ultimate 3.5 to be precise), it simply made the screen go black for a second and took me back to the recovery menu. So figuring it was a bad download, I downloaded a smaller ROM but when I rebooted I accidentally went into PhilZ Touch menu instead. Deciding to do the usual wipe before flashing, here's where I messed up like an idiot. I saw an option along the lines of "Wipe CLEAN for flashing ROM" or something and trusted it so much despite it saying it's gonna wipe the system partition clean as well (I still don't know why I accepted even when warned of that).
So basically now I have a system that boots the SONY splashscreen and then goes black with the back light still on unless the battery runs out. I can't shut it down no matter how long I hold the power button and if I restart, it boots back to the same thing. I have no recovery menu now thanks to my genius idea of wiping the system, and the only thing I can enter is flashmode. So when I try to flash an FTF firmware (I tried every firmware I could get) back into the phone with Flashtool, it would simply say "preparing for flashing" for about a minute before it says "device disconnected" because the phone decides to exit flash mode and boot normally. I have a locked bootloader (with bootloader unlocking allowed), so I can't flash recovery menus. When I try booting by holding the VolumeUp key and plugging it in, it enters flash mode only with the red LED on and I still get the same results on Flashtool.
Was wondering if there were any ways around this that I might have missed before deciding to open the phone and change the hardware? And if it comes to that, what would I need to change (have always been a software guy when it comes to phones)? Any tips and advice would be appreciated.
TLDR: Have a bricked c6603 from wiping the system, that can't shutdown and keeps rebooting and refuses to be flashed.

If you have time before the phone reboots, hold Volume UP and the power key for 15 seconds. The phone will vibrate once at 10 seconds. Keep holding the keys until you feel 3 vibrations. This will hard power down the phone.
Sent from my C6603

^I've tried this and it simply boots back up again.

Hmm. That should definitely shut the device down, not restart it.
Sounds like there could possibly be an issue with your power button. I've heard of issues with the power button after water damage. Have you checked the water ingress indicators under the flaps? If any are red, it points to earlier damage from water.
Sent from my C6603

kingvortex said:
Hmm. That should definitely shut the device down, not restart it.
Sounds like there could possibly be an issue with your power button. I've heard of issues with the power button after water damage. Have you checked the water ingress indicators under the flaps? If any are red, it points to earlier damage from water.
Sent from my C6603
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Seems like you're right, I just checked it and it indeed has a faded red color on it. Do you think if I take the phone apart it the power button could be fixed or should I swap something else inside this from another Xperia?

7ty6er said:
^I've tried this and it simply boots back up again.
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I experienced this problem
Pls hold down volume When u connect your phone to pc via flashtool,
It will connect in flash mode
After that , just flash 0.230 kernel via flash mode ( kernel not rom )
Then disconnect your phone
Turn it off ( hold power button and volume up till it vibrates 3 times )
Then before it turn on again , hold down the volume down and connect it to pc via usb and this time flash 0.283 Rom ( not kernel )
This worked for me