Help: I can't access the bootloader on Z3c - Xperia Z3 Compact Q&A, Help & Troubleshooting

Dear XDA users,
I want to unlock my (GFs) Z3c and I am unable to access the bootloader.
Starting the phone with Power + VolDown does not do anything, as long as the VolDown is being held, the screen stays black. When powering up the phone with Power and hit VolDown right after that, there is a loop where the phone shows the Sony logo and turns black each ~15 seconds.
Executing "adb reboot bootloader" shuts off the phone (the LED shows blue after that).
The device is a refurbished one with branding from "Telekom Germany" that we got as a replacement from our phone insurance after dropping the first one.
Is it possible that the bootloader is hidden somehow or missing/faulty?
What can I do?
I have working Flashtool and ADB on Win10 Pro (with disabled driver signature checks).

die_braut said:
Dear XDA users,
I want to unlock my (GFs) Z3c and I am unable to access the bootloader.
Starting the phone with Power + VolDown does not do anything, as long as the VolDown is being held, the screen stays black. When powering up the phone with Power and hit VolDown right after that, there is a loop where the phone shows the Sony logo and turns black each ~15 seconds.
Executing "adb reboot bootloader" shuts off the phone (the LED shows blue after that).
The device is a refurbished one with branding from "Telekom Germany" that we got as a replacement from our phone insurance after dropping the first one.
Is it possible that the bootloader is hidden somehow or missing/faulty?
What can I do?
I have working Flashtool and ADB on Win10 Pro (with disabled driver signature checks).
Click to expand...
Click to collapse
1. Check if bootloader unlock allowed = yes, (open dialer, enter *#*#7378423#*#* and go to service info-configuration).
2. If yes, unlock bootloader - https://developer.sonymobile.com/unlockbootloader/unlock-yourboot-loader (backup ta if you want - https://forum.xda-developers.com/cr...versal-dirtycow-based-ta-backup-t3514236/amp/)
3. Flash recovery: install official TWRP app, select recovery for Z3c, download and flash on computer with terminal command 'fastboot flash recovery'.

I confirm the same issue as OP. I've downloaded the respective firmware and have confirmed via the service page that the bootloader is unlocked.
Now I'm trying to boot into fastboot via "adb reboot bootloader" and my phone looks like it turns off (no notification lights). When I type "adb devices" and "fastboot devices" both are blank ("adb devices" could find the device prior to the reboot command).
I also tried the Sony instructions and pressing Vol Up + Plugging in USB and this also has the same result as above. Not sure what to do next.
Update: I'm using Windows 10 and the problem was that it would not install the unsigned drivers that came with Flashtool. Once I rebooted Windows in troubleshooting mode (Shift + Restart) and disabled the signed driver requirement, Flashtool installed correctly. I reflashed the phone for good measure and now following the normal steps fastboot devices picks up the phone.

Related

[Q] Totaly bricked?

@alray
i did search arround, but haven't found nothing similar with my problem..
i able to recover a phone if i cannot enter in fastboot or recovery. in bootloader it works but it freezing in the moment i push power button to choose fastboot or recovery. also it doesn't boot normal-> it's starting, showing the "htc powered by android" screen then goes off.
mention: in the bootloader is no "Active CMDline overflow" message.
only thing i'm interested if it's possible recover from this.
bodom[prodigy] said:
@alray
i did search arround, but haven't found nothing similar with my problem..
i able to recover a phone if i cannot enter in fastboot or recovery. in bootloader it works but it freezing in the moment i push power button to choose fastboot or recovery. also it doesn't boot normal-> it's starting, showing the "htc powered by android" screen then goes off.
mention: in the bootloader is no "Active CMDline overflow" message.
only thing i'm interested if it's possible recover from this.
Click to expand...
Click to collapse
try this: http://forum.xda-developers.com/showthread.php?t=2739126
if you're S-Off and it doesn't work then you need to downgrade hboot first. if you are S-On and it doesn't work, then
stuck at 1st step.. "fastboot devices", nothing listed.
i have drivers instaled, also the Universal Adb Driver. what am i missing? if i try the to flash anyway the recovery it says <wait for device>
bodom[prodigy] said:
stuck at 1st step.. "fastboot devices", nothing listed.
i have drivers instaled, also the Universal Adb Driver. what am i missing? if i try the to flash anyway the recovery it says <wait for device>
Click to expand...
Click to collapse
try faq#2: http://forum.xda-developers.com/showpost.php?p=52135024&postcount=2
EDIT: you are in bootloader right? FASTBOOT USB (in red)
oh nooo... if i would be in fastboot usb i wouldn't ask for help..
it's in bootloader where i have to choose between
fastboot
recovery
factory reset
...etc
and here, if i choose any of above it is freezing, with the option i choosed highlighted. that's all
but as far as i know.. even in this stage, i mean in bootloader where am i, if i type fastboot devices should see the device.no?
bodom[prodigy] said:
oh nooo... if i would be in fastboot usb i wouldn't ask for help..
it's in bootloader where i have to choose between
fastboot
recovery
factory reset
...etc
and here, if i choose any of above it is freezing, with the option i choosed highlighted. that's all
but as far as i know.. even in this stage, i mean in bootloader where am i, if i type fastboot devices should see the device.no?
Click to expand...
Click to collapse
you need to select "fastboot" using the power button, to get to FASTBOOT USB
nkk71 said:
you need to select "fastboot" using the power button, to get to FASTBOOT USB
Click to expand...
Click to collapse
i can select fastboot, but when i press power button, the bootloader freeze. it does not enter in FASTBOOT USB.neighter in recovery or any of the options of the bootloader. it's freezing with the option highlited after i press power button. after the freeze, only thing i can do is to keep power button+volume down, to restart to bootloader, where again, if i choose any of the options, it freeze again. also doesn't boot in normal mode, it's just showing the "HTC powered by android" then goes off.
bodom[prodigy] said:
i can select fastboot, but when i press power button, the bootloader freeze. it does not enter in FASTBOOT USB.neighter in recovery or any of the options of the bootloader. it's freezing with the option highlited after i press power button. after the freeze, only thing i can do is to keep power button+volume down, to restart to bootloader, where again, if i choose any of the options, it freeze again. also doesn't boot in normal mode, it's just showing the "HTC powered by android" then goes off.
Click to expand...
Click to collapse
what hboot are you on? 1.44?
unplug the cable,
force reboot,
select FASTBOOT,
when it shows FASTBOOT (in red),
plug the cable to your computer, and it should change to FASTBOOT USB
.
1.57,
it remains highlithed in blue. it freezes highlighted in blue.
there you got it. i recorded what happens, if you have patience 2-3 mins.
ignore the cracked screen, i disassambled the phone to disconnect the battery, in hope of something would work after.. and did not matter for me if that i damaged it, i have new full housing with touchscreen for it.
https://www.youtube.com/watch?v=thNiKBSYsQc&feature=youtu.be

Very hard Brick. Only Bootloader warning

Hello there. Me was given a Razr i XT890. If i turn on there only the "Warning Bootloader unlocked". I try to get in Fastboot mode or any other mode but i only stuck in this window or nothing. I dont even get a Batterylogo if i load with the wall charger. I put it on my PC but nothing happens. No new Device. No ADB. Nothing. Can i rescue the phone or is it only a paperweight?
Most likely a brick. U could try to do something with the xfstk flasher. Search it up, get the right files and hope it works
It's recoverable!
Gindler said:
Hello there. Me was given a Razr i XT890. If i turn on there only the "Warning Bootloader unlocked". I try to get in Fastboot mode or any other mode but i only stuck in this window or nothing. I dont even get a Batterylogo if i load with the wall charger. I put it on my PC but nothing happens. No new Device. No ADB. Nothing. Can i rescue the phone or is it only a paperweight?
Click to expand...
Click to collapse
The first thing you should do is to see this video (https://www.youtube.com/watch?v=OTzaiwj-bGw) to install libusb on your computer (if you are using Win 8 or 10 you will need to remove the signing imposition on driver installation - search for it).
The second action is to download the programs provided in this other topic of the community:
Download -> https://forum.xda-developers.com/attachment.php?attachmentid=1795067&d=1362945847
Topic Forum - >https://forum.xda-developers.com/showthread.php?t=2184877
Then follow the instructions:
1 - With the cellphone turned off, connect it to the pc by the USB cable holding the camera button, when vibrate, release. (The green light should be on).
2 - Run xFSTK-SoC-Driver-Setup-1.0.3.exe and follow the instructions. (Your cellphone will probably turn on and will be locked on the bootloader unlock warning screen).
3 - If the phone has turned on, it will remain locked, then press and hold the camera buttons + volume down + power button. (It should vibrate, then release the buttons, if all goes well it will turn green).
4 - Run the unbrick.bat, when you start the prompt keep holding down the volume button of your cell phone. (If all goes well it will restart, continue with the down volume button pressed, when on it should enter fastboot mode.
If you get here and he gets into fastboot mode, CONGRATULATIONS you got it. Now just install the rom via RSD Lite. (Look up if you do not know)
Remember that your cell phone must have the bootloader unlocked for installation of the factory rom.
I do not guarantee origin, be aware that it is at your own risk
I hope I have helped!
Great! People from everywhere thanks you a lot.
brun0_csa said:
It's recoverable!
The first thing you should do is to see this video (
) to install libusb on your computer (if you are using Win 8 or 10 you will need to remove the signing imposition on driver installation - search for it).
The second action is to download the programs provided in this other topic of the community:
Download -> https://forum.xda-developers.com/attachment.php?attachmentid=1795067&d=1362945847
Topic Forum - >https://forum.xda-developers.com/showthread.php?t=2184877
Then follow the instructions:
1 - With the cellphone turned off, connect it to the pc by the USB cable holding the camera button, when vibrate, release. (The green light should be on).
2 - Run xFSTK-SoC-Driver-Setup-1.0.3.exe and follow the instructions. (Your cellphone will probably turn on and will be locked on the bootloader unlock warning screen).
3 - If the phone has turned on, it will remain locked, then press and hold the camera buttons + volume down + power button. (It should vibrate, then release the buttons, if all goes well it will turn green).
4 - Run the unbrick.bat, when you start the prompt keep holding down the volume button of your cell phone. (If all goes well it will restart, continue with the down volume button pressed, when on it should enter fastboot mode.
If you get here and he gets into fastboot mode, CONGRATULATIONS you got it. Now just install the rom via RSD Lite. (Look up if you do not know)
Remember that your cell phone must have the bootloader unlocked for installation of the factory rom.
I do not guarantee origin, be aware that it is at your own risk
I hope I have helped!
Click to expand...
Click to collapse
Hey, Bruno! You prolly don't open this forum anymore, but I'm trying to unbrick a moto razri that has this exact problem. I'm trying to follow the steps you sent, but it's pretty confusing, since some of these files are from 2009 or from some other windows like XP, Vista, or 7, and I'm trying to do all of this on my Windows 10 machine. Can you please try to update these steps? Thanks!

My phone won't start

Hello,
i think I've broken my phone, I hope you can help me.
I followed this tutorial that you can download here : (I can't post the link because I'm a new user)
I've tried to unlock the boot loader with success, then the installer tried to install a recovery (as the text in the command window said) and the progress stopped, I have waited a couple of minutes but nothing happend and I disconected the phone from my computer (I know that was a bad idea).
Know my phone won't start, not even in the recovery mode. I can hold the Vol +, Vol - button and the power button but only the huawei logo appears, then turns the screen black and nothing more happens. I have also disconnected the battery for some minutes but this didn't change anything.
The only positiv thing is, that Fastboot still recognizes the phone when it's connected to my PC, but I still can't enter the fastboot mode.
I hope you can help me and save my phone,
thankfull Robin
Flash twrp in it, and than install persona's B602 rom.
D1stRU3T0R said:
Flash twrp in it, and than install persona's B602 rom.
Click to expand...
Click to collapse
First of all thank you for your reply. But I can't put my phone with my computer and minimal ADB in fastboot mode. The device is found with the command "adb devices" but it has only recovery status. When I type in "adb reboot bootloader" then Huawei logo flashes up and then it goes back to blackscreen.
I fixed it
I fixed the phone by myself. I'm not an expert at all and this is for the people with the same problem.
I think the problem was, that the phone won't leave the recovery mode, because it was listed with "apd devices" as "recovery" for the whole time.
So I tried to install a stock ROM via SD Card with a tool named au_temp.cfg and the phone actually did more then just turning back off when i pressed the Vol+, Vol- and Power key. So the phone actually entered the bootloader but I got the wrong stock image, but this didn't mattered because after one try the phone got back to normal mode and booted quite fine. So I think the main problem was, that my phone was stuck in a recovery mode and needed help to exit it.

Mi A2 BOOTLOOP can't get into Fastboot or Recovery

So i followed this guide to root my Mi A2 "theandroidsoul (insert dot here) com/xiaomi-mi-a2-root/"
It went all fine but the phone was still not rooted. So i thought maybe get the newest Magisk.zip wich i put on the phone.
So I went back to step 11. to install the new version with TWRP but it didnt go to TWRP although i held the volume up butten and then used the command "fastboot reboot" and then it weent into bootloop
so i Guess i am stuck on my Partition A (in my case) where i installed TWRP but i cant shut the phone dont to get into fastboot and ADB says Error: no device Found".
I Need Help plssss :crying:
If you cant go to fastboot then you need open up phone and use testpoint to force edl mode
But before that hold volume down and power for 10-15 sec to force fastboot
The battery is drained now, i tried to plug it in to the wall and boot into fastboot right away, i saw the fastboot screen for a splitsec but it cut off because it had not enough charge, so i left it plugged in and tried to go to fastboot constantly till the phone had enough charge to hold the boot, i was in fastboot for about 1 minute or so (my plan was to charge it in fastboot mode, leave it like that and then go to the pc to change the active partition back, but the pc didnt recognise the phone) but after that it startet bootlooping again while it was in fastboot.
Could i try to got to TWRP with "volume up + power button" ? and change the active partition in there?
Facing almost similar problem like you yesterday.
Try method I post here
https://forum.xda-developers.com/mi-a2/how-to/ota-v9-6-5-0-odimife-t3823445/page24
1. Have phone in fastboot mode
2. Launch adb cmd (NOT your pc usual cmd)
3. Connect to pc, type 'fastboot devices'

Question Stuck in bootloop, cannot reach fastboot

Hey, I have tried flashing a GSI ROM but got an error after attempting these two commands :
MrScarl3t said:
./fastboot erase system
./fastboot flash system Gsi.img
Click to expand...
Click to collapse
The "system" partition could not be found and after reading some of your comments I figured I had to reboot into fastbootd and not fastboot. Therefore I rebooted my phone but I am now stuck into a bootloop without being able to reach fastboot whatsoever. Holding down the volume down key does not seem to have any effect.
A few more details:
- adb does not detect my device anymore.
- I was previously on a stock ROM.
- I only managed to flash the vbmeta.img before the bootloop happened.
- Upon holding the volume up button, my phone briefly connects to my PC (for about 2 seconds) then disconnects and restarts again.
What could I do to be able to reach fastboot and flash the stock ROM again?
Thanks for reading
Hold power button + volume down button for 30 second if fails then drain the battery then repeat the process.
My battery is drained and no matter how long I hold the two buttons I can't get out the bootloop unfortunately...
-let the cable connected to pc and press (+ and power) when the splatch screen appears wait 3 secondes and release the power button keeping + button only.
-if not, try with an OTG disk inserted and do the same as above.
-if not, type on pc terminal: adb reboot recovery before connecting your phone.
Good luck.
Hey, thanks a lot for your reply
I have tried all the steps you've described me and I unfortunately can't reach recovery.
It seems as if the phone is reacting to it though as a black screen screen is displayed much longer than usual, although a few seconds later, the MI splash screen appears once again. Also, I can hear the beep from the pc when the phone connects but it keeps disconnecting 1 second later and proceeds to reboot. Seems like recovery is corrupted or something...
The phone does not show up under adb devices throughout the whole process. My pc only recognizes the usb port being connected (when the beeps are triggered) but does not identify the device as an android device.

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