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My apologies if this is obvious to you all but ive been roaming back n forth over all the threads trying to find the best course of action. I am looking to root my device (c6903) to 4.3 rooted. I am currently running 14.1.G.2.257 I understand that this firmware cant be rooted and i need to downgrade to 14.1.G.534.
Q1 do i then wait once rooted for the OTA update or do i then backup my TA and flash a rooted generic 4.3 using flashtool?
Q2 is it better to just update to 4.3 generic unrooted and wait for this firmware to be rooted which i believe is being worked on. I have noted that my device can unlock the bootloader if this helps?
Thank you for any advice im a bit confused on which course to take
I have a c6902 in the USA on Tmobile. I used Pc companion to update to stock .290 firmware (Jellybean 4.3), lost root (and thought I was fine without it).
I read a thread about downgrading using FTF on flashtool and that your sim card won't work correctly? (I think that's what i read).
I just wanted to know is this correct or did I misread something?
I'm wanting to revert to the firmware before .290, looking at the FTF thread it looks like .257 is what i need, but Which of the three?
my software id is: C6902 R4B
C6902 14.1.G.2.257 Commercial/Journalist 1277-1348_R1A
C6902 14.1.G.2.257 Generic IN 1277-2364_R5A
C6902 14.1.G.2.257 Generic TH 1276-7160_R4A
Is there anything else I should know or do before downgrading? (aside from making a TA backup?)
I want to downgrade to gain full root again, and the minor annoyances I'm encountering will go away too (mainly sound output issues since upgrading; i.e lost the stock tones i was using for alarms and phone has been rebooted a few times to make notification/ringtones output {stock and custom})
Sorry for my noobishness, (cut my teeth on android using htc phones for the past 3-4 years, this Z1 is slightly foreign to me)
That is correct, you'll lose sim card detection like I did. I used the sony PC Companion to reset my phone (so I got sim detection back), then followed this guide:
http://techbeasts.com/2013/12/19/in...ng-latest-14-2-0-a-290-firmware-how-to-guide/
Took less than 20 minutes and was so easy.
Shroomster said:
I have a c6902 in the USA on Tmobile. I used Pc companion to update to stock .290 firmware (Jellybean 4.3), lost root (and thought I was fine without it).
I read a thread about downgrading using FTF on flashtool and that your sim card won't work correctly? (I think that's what i read).
I just wanted to know is this correct or did I misread something?
I'm wanting to revert to the firmware before .290, looking at the FTF thread it looks like .257 is what i need, but Which of the three?
my software id is: C6902 R4B
C6902 14.1.G.2.257 Commercial/Journalist 1277-1348_R1A
C6902 14.1.G.2.257 Generic IN 1277-2364_R5A
C6902 14.1.G.2.257 Generic TH 1276-7160_R4A
Is there anything else I should know or do before downgrading? (aside from making a TA backup?)
I want to downgrade to gain full root again, and the minor annoyances I'm encountering will go away too (mainly sound output issues since upgrading; i.e lost the stock tones i was using for alarms and phone has been rebooted a few times to make notification/ringtones output {stock and custom})
Sorry for my noobishness, (cut my teeth on android using htc phones for the past 3-4 years, this Z1 is slightly foreign to me)
Click to expand...
Click to collapse
On a C6906, I had no issues whatsoever downgrading from 290 to 257.
TagEHeuer said:
That is correct, you'll lose sim card detection like I did. I used the sony PC Companion to reset my phone (so I got sim detection back), then followed this guide:
http://techbeasts.com/2013/12/19/in...ng-latest-14-2-0-a-290-firmware-how-to-guide/
Took less than 20 minutes and was so easy.
Click to expand...
Click to collapse
So you downgraded, used pc companion to repair your problem while on .257, rooted, upgraded then rooted again?
Following that guide, I have a locked bootloader currently. If I unlock it on .290, do I lose any functionality or does the phone just factory reset?
sent from my rooted Xperia Z1
Shroomster said:
So you downgraded, used pc companion to repair your problem while on .257, rooted, upgraded then rooted again?
Following that guide, I have a locked bootloader currently. If I unlock it on .290, do I lose any functionality or does the phone just factory reset?
sent from my rooted Xperia Z1
Click to expand...
Click to collapse
I unlocked it on .290 and I didn't lose any functionality or it didn't factory reset (back up in case) http://techbeasts.com/2013/12/18/how-to-unlock-bootloader-of-sony-xperia-devices-guide/
I used Sony to reset all my phone back to the latest firmware which was .290 (as I lost sim defextion), then just followed the guide I originally posted.I never downgraded.
Sent from my C6903 using Tapatalk
So what did you do to lose sim card operation?
sent from my rooted Xperia Z1
Shroomster said:
So what did you do to lose sim card operation?
sent from my rooted Xperia Z1
Click to expand...
Click to collapse
I tried flashing back to .534 from .290 after I upgraded to 4.3. It kept boot looping then bricked.
Simply, you have 2 solutions to downgrade without losing SIM signal.
1- Downgrade from 290 to 257, then from 257 to 534 (then root then OTA to 257 if you downgraded to root it).
2- When downgrading from 290 to 534, exclude "Baseband" in Flashtool and you'll be good to go.
Regards,
~J2C
The only problem I have is I can't find ftf in the ftf thread for my c6902 that matches my id
sent from my rooted Xperia Z1
Dial *#*#7378423#*#* then go to service info then software info and see what is your customization number and look for that number in the ftf thread.
If you want to go back to 257 for root, then you have 2 options:
1- flash 257, then 534, root and OTA to 257.
2- flash 534 and exclude baseband then, root and OTA to 257.
Regards,
~J2C
Just2Cause said:
Dial *#*#7378423#*#* then go to service info then software info and see what is your customization number and look for that number in the ftf thread.
If you want to go back to 257 for root, then you have 2 options:
1- flash 257, then 534, root and OTA to 257.
2- flash 534 and exclude baseband then, root and OTA to 257.
Regards,
~J2C
Click to expand...
Click to collapse
Yes, I read how to find my ID, and it is not listed in the ftf thread. C6902 R4B
sent from my rooted Xperia Z1
Shroomster said:
Yes, I read how to find my ID, and it is not listed in the ftf thread. C6902 R4B
sent from my rooted Xperia Z1
Click to expand...
Click to collapse
There are numbers before the "R4A", look for the numbers, not the R4A.
Just2Cause said:
There are numbers before the "R4A", look for the numbers, not the R4A.
Click to expand...
Click to collapse
Yes, and I'm not sure if the initials in the files stand for the region it is from.
there are three possible files for me to download for the c6902:
IN
TH
journal/commercial
No idea what the differences are.
By the way...unlocking the bootloader did wipe my phone/factory reset it. Oh well I was prepared none the less...
I just realized I didn't reset the usb debugging/dev options, which is why the fastboot isn't working damnit lol...
EDIT----got fastboot working, just can't get the recovery to work. I press up then down, blue light flashes then phone boots to home screen, not recovery.
EDIT---- apparently the key sequence is hold up then press down but keep holding up? can anyone confirm this for me?
Final EDIT-----GOT IT ALL WORKING.... thanks for the help everyone...
Welcome.
Hello,
I recently bricked my Z1 and just got it back from warranty repaired. It is a C6906 that they upgraded to 4.3 (.290) however it is branded to BELL and I wish to flash the unbranded generic so I don't have as much bloatware/fast updates.
Since I do not wish to brick the device again and go through this again and so I am looking for advice to do this in a way that is guaranteed. With flashtool if I flash "C6906 14.2.A.0.290 Generic CA 1276-7484_R2B" would I have any issues at all? Just load up Flashtool - select the ftf and just use the default settings and plug in the Z1 while holding down the volume button.
I used the latest Flashtool v0.9.13, connected to PC, let install windows the drivers, selected the Unbranded Stock ftf, wiped all data, appslog, cache, all the rest unchecked and I performed the flash. All fine and the phone working well. I don't know why you had problems or why you bricked the phone but there is no advice to give you because it's simply. So even if all it's clear no guarantee and it's up to you. I don't think is the FTF faulty.
eclyptos said:
I used the latest Flashtool v0.9.13, connected to PC, let install windows the drivers, selected the Unbranded Stock ftf, wiped all data, appslog, cache, all the rest unchecked and I performed the flash. All fine and the phone working well. I don't know why you had problems or why you bricked the phone but there is no advice to give you because it's simply. So even if all it's clear no guarantee and it's up to you. I don't think is the FTF faulty.
Click to expand...
Click to collapse
This is separate from how I bricked it (using custom rom), I did this previously with a older version and just not on .290 and I am wondering if there is any issues (IMEI etc) doing it .290 to .290, thats all. I just don't want to make a mistake.
magwart said:
This is separate from how I bricked it (using custom rom), I did this previously with a older version and just not on .290 and I am wondering if there is any issues (IMEI etc) doing it .290 to .290, thats all. I just don't want to make a mistake.
Click to expand...
Click to collapse
Ok, so you bricked the phone with custon rom, now I understand. In this case there is no any issues flashing .290 unbranded on .290 branded. IMEI is lost only when jumping .257 and downgrade directly to .534. It's more "safe" flash .290 on .290. Go flash now.
eclyptos said:
Ok, so you bricked the phone with custon rom, now I understand. In this case there is no any issues flashing .290 unbranded on .290 branded. IMEI is lost only when jumping .257 and downgrade directly to .534. It's more "safe" flash .290 on .290. Go flash now.
Click to expand...
Click to collapse
Thanks. I don't suppose there is any working root for 4.3 yet, is there for the C9606?
Edit: Successfully flashed. Thanks again.
magwart said:
Thanks. I don't suppose there is any working root for 4.3 yet, is there for the C9606?
Click to expand...
Click to collapse
No direct root, like Vroot or 360, for .290 at the moment, just a method to get full root for Locked Bootladers. To do that you have to downgrade, root, install recovery then update to .290 again, a bit longer to get root on your phone, sure this method working for C6902/3 but should work for C6906 too, just check.
Would I be able to go from 290 branded to the new 136 intended without issue? I already bricked one device trying to root and I'm just trying to make sure lol
akusokuzan said:
Would I be able to go from 290 branded to the new 136 intended without issue? I already bricked one device trying to root and I'm just trying to make sure lol
Click to expand...
Click to collapse
Probably because when you bricked your phone was the time when some issues was not discovered yet in do that, and this confirm the fact on the thread now is wrote "How not brick your phone" . BTW, the risk to brick the phone is in downgrading so if you want just to upgrade without Root this way should be more "safe" and you will be able to do it without any issue.
eclyptos said:
Probably because when you bricked your phone was the time when some issues was not discovered yet in do that, and this confirm the fact on the thread now is wrote "How not brick your phone" . BTW, the risk to brick the phone is in downgrading so if you want just to upgrade without Root this way should be more "safe" and you will be able to do it without any issue.
Click to expand...
Click to collapse
Lol yeah, when I was trying to update with root, it didn't go so hot. That thread wasn't stickied until after the debacle. Sounds good though, thanks!
My phone has OS 290 need to downgrade to 257 to root but the file doesn't show up in flashtool i downgraded to 534 before but lost IMEI so went back to 290
Follow NUT's thread in Android Development section in order to root your Z1.
Sent from my C6903 using XDA Premium 4 mobile app
ryanraven said:
My phone has OS 290 need to downgrade to 257 to root but the file doesn't show up in flashtool i downgraded to 534 before but lost IMEI so went back to 290
Click to expand...
Click to collapse
Even I am facing this issue. The flashtool does not seem to recognize .257 at all. Not sure on the reason.
Gurus - Any idea on why the flash tool is not recognizing .257?
@livelyyoungman, @ryanraven Use the FTF .534 provided by NUT to avoid IMEI lost, then follow the instructions to upgrade to .290. Read carefully the thread.
Even I had lost the IMEI when I flashed wrong firmwares 534 rom.
you need to flash .534 based on your firmware c6902 or c6903 or whatever it is. Root your phone and then use nut tutorial to upgrade and keep the root.
Losing IMEI is not even a problem at all because when you will update to .290 or .136 it will be back so do not be worry about it.
matharuajay said:
Even I had lost the IMEI when I flashed wrong firmwares 534 rom.
you need to flash .534 based on your firmware c6902 or c6903 or whatever it is. Root your phone and then use nut tutorial to upgrade and keep the root.
Click to expand...
Click to collapse
I flashed the correct firmware. The one I used was C6902_14.1.G.1.534_Generic IN firmware that I downloaded from the link provided in this forum (MEGA link). Excluded "Baseband" as well. Still IMEI went missing
eclyptos said:
Losing IMEI is not even a problem at all because when you will update to .290 or .136 it will be back so do not be worry about it.
Click to expand...
Click to collapse
I was not worried on this, as I did read about the issues on downgrading and was fully aware that by flashing to the latest version I would be getting back the IMEI.
Now I have successfully downgraded to .534 as well - just flashed first the global .257 and then the generic IN version of .534. All is well now. Was able to root the phone as well. But now I am facing camera issues; may be a visit to the service center is what seems looming @ large.:crying:
livelyyoungman said:
But now I am facing camera issues; may be a visit to the service center is what seems looming @ large.:crying:
Click to expand...
Click to collapse
If you unlocked bootlader then with .534 or .257 the camera not working, update to .290 or .136 and your camera will be back again.
eclyptos said:
If you unlocked bootlader then with .534 or .257 the camera not working, update to .290 or .136 and your camera will be back again.
Click to expand...
Click to collapse
No I have not yet unlocked the BL. But I find the following issues when using the camera:
1. "Camera Not Available" message appears sometimes. It does disappear but upon taking photos after this message a BLUE hue is visible at the bottom of all the pictures I shoot. Only a reset restores the camera function properly.
2. The phone keeps rebooting at least once every day.
I was reading few of the other posts and find that these two could be related to HW malfunction. Hence wanted to visit the service center to figure out the process for replacing the phone. I have already visited the service guys early last week for these two issues. They flashed my mobile once again and returned back to me for checking. :crying:
A factry reset in needed after update. If you are not on latest FW then update.
eclyptos said:
A factry reset in needed after update. If you are not on latest FW then update.
Click to expand...
Click to collapse
Yes did that as well. But still it does re-appear. So just wanted to confirm if there is really any hardware issue with my piece.
livelyyoungman said:
Yes did that as well. But still it does re-appear. So just wanted to confirm if there is really any hardware issue with my piece.
Click to expand...
Click to collapse
Then something wrong. Call Sony to understand if you should sent it back.
I want help regarding installing 4.4 in my z1 c6902..
I have rooted and unlocked bootloader...
I made changes in system/app
what to do to receive 4.4 via ota via sony....
BUT MY SONY PC COMPANIAN IS READING MY DEVICE AND SHOWING UPDATE..WILL I UPDATE OR NOT??
pathanraj said:
I want help regarding installing 4.4 in my z1 c6902..
I have rooted and unlocked bootloader...
I made changes in system/app
what to do to receive 4.4 via ota via sony....
BUT MY SONY PC COMPANIAN IS READING MY DEVICE AND SHOWING UPDATE..WILL I UPDATE OR NOT??
Click to expand...
Click to collapse
Even though PC Companion is showing that your phone has an update, if you try to perform the update, you will get an error that the software has been modified (because of unlock bootloader) and you cannot proceed.
If you want to update a phone with unlocked bootloader, you need to use Sony Flash tool.
Note that updating via PC Companion or Sony Flash tool, will result in your root being lost.
hush66 said:
Even though PC Companion is showing that your phone has an update, if you try to perform the update, you will get an error that the software has been modified (because of unlock bootloader) and you cannot proceed.
If you want to update a phone with unlocked bootloader, you need to use Sony Flash tool.
Note that updating via PC Companion or Sony Flash tool, will result in your root being lost.
Click to expand...
Click to collapse
Where can i get file to flash with flash tool for my z1 C6903
Thanks in advanced
Look in the general section,
There is a sticky thread (Meaning its always near the top) full of the FTFs....