If I understand correctly, The TA partition stores the SIM lock flags. If this is the case, Say I backup my TA whilst my phone is sim locked(call this backup A). While the bootloader is still locked, I unlock the device. If I unlock the bootloader, and later decide I want to relock, I restore backup A.
Will the device be locked again or not?
Is it necessary to redo backup after sim unlocking?
Related
Hi all....
2 quick questions....
My Nexus LTE is rooted
when I try to boot into recovery......either with ROM Manager or fastboot...I get the Android with the red triangle.....is it because I have my bootloader locked???
Even though I unlocked it to root...I locked it just in case I have to bring it back to Verizon...
also......If I do have to unlock it to get to recovery.........after I unlock it...would I lose all my data and apps?
1. If you've not unlocked it yet then unlocking it will delete everything
2. You need to unlock it and then flash ClockworkMod to be able to flash a new ROM
I'm about to do this also.
Unlock, root.
I think what the OP is asking is once you unlock and root... can you relock the bootloader without messing up root?
Also when you unlock and it wipes your phone, does it erase everything I've copied over to the internal SD card? I have like 10gb's of music, files, pics, etc.
I think the answer to the above is YES. But just want to make sure. That would really suck as I normally wipe my phone often when crackflashing. Sometimes I'll flash a rom but find out mid-day that it sucks and it'll require a wipe and reload an older version.
Anyway, rooting seems easy enough. Push some files. I'm just curious about how the internal SD card plays its role in all this... as I've always had an SD Card.
hogowner said:
Hi all....
2 quick questions....
My Nexus LTE is rooted
when I try to boot into recovery......either with ROM Manager or fastboot...I get the Android with the red triangle.....is it because I have my bootloader locked???
Even though I unlocked it to root...I locked it just in case I have to bring it back to Verizon...
also......If I do have to unlock it to get to recovery.........after I unlock it...would I lose all my data and apps?
Click to expand...
Click to collapse
I am no expert - but I am pretty sure you are correct.
1. You re-locked your bootloader. So - no custom recovery.
2. Unlocking your bootloader is going to wipe everything. Including your "sd card partition" (whatever you want to call it). So if you have pictures or other important files you need - transfer them before you unlock your bootloader.
3. I would just leave it unlocked. If you need to lock it for warranty issues it is very easy to re-lock. Right? Isn't it something like...
Code:
reboot into bootloader
enter the fastboot command
fastboot oem lock
done
hope that helps. maybe someone will chime in.
So unlocking the bootloader will Kill your sd card files. What about normal wipes from CWM?
I rooted...(no custom rom...leaving it stock)...then relocked my bootloader.....
I then installed all the apps I wanted........
I also was able to get into CWR and make a backup...
now if I try to go into CWR I get the android with the red triangle
why? Is it because I locked the bootloaded? Is that why I get the red trianlge? because bootloader is locked? I can't even get into stock recovery and if it is...if I unlock the bootloader...It will wipe data..and I dont feel like doing that right now.....unless there is another way to get the red triangle fixed
EDIT::::::::::::::::::::: I went to my Rom Manger app...and I reinstalled CWR...and lo and behold.....I was able to boot into Recovery with no problem.....even with my bootloader locked.......
will restoring ta partition unroot my phone and will i be able to get ota updates back?and how should i unlock my bootloader without providing my imei to the sony people?
Hello everyone, I did my best to help a few people in Q&A section, but now, I have a few questions myself, all of them, regarding mysterious TA partition.
My C1905 came out of the box with branded 15.1.C.2.8 firmware. One of the first things I did after rooting the device was backing up my TA partition, knowing that I will sooner or later unlock the bootloader. However, I then cross-flashed unbranded C2005 15.2.A.2.5 firmware. My questions are:
1)Do I need to backup TA partition again on a new firmware to be able to relock my bootloader without changing it? Does the TA partition vary between firmwares?
2)Will changing my firmware again to official 4.2.2 for C1905 (which should be released within 2 months) require my to back it up again? Is the C2005's TA partition different than C1905's?
3)Just out of curiousity, what exactly does the TA partition contain? From what I've read, it stores unique "DRM keys", but that doesn't tell me much. Are these keys linked with any hardware (like - for comparison - Samsung's "EFS" folder stores IMEI, MAC adress product code etc and without it, phone has very limited capabilities), or is it just more like "locked bootloader certificate"?
I just want to clear that up, thanks in advance for answering.
3) TA partition contains DRM(Digital Rights Management ) keys, as you said, and other bootloader and hardware related information.
As for the relocking part the problem is the DRM keys...If you read some of the wiki article i linked then you will understand how they are being used in order to prevent locking the bootloader again.
Some software requires those to run, Ex:Bravia Engine2(we dont have that in our phones, but if we had and unlocked the bootloader we wouldn't be able to use it).
1),2)No, you have unlocked your bootloader and your DRM keys are gone, you have them only in your back up. If you want to relock then you will restore your backup while in stock rom-kernel.
stamatis said:
1),2)No, you have unlocked your bootloader and your DRM keys are gone, you have them only in your back up. If you want to relock then you will restore your backup while in stock rom-kernel.
Click to expand...
Click to collapse
I think you didn't fully understand the first question. Can I backup TA of my current firmware and then use that back up to relock bootloater WITHOUT changing it back to the stock 15.1.C.2.8? Or do I HAVE to roll back to stock firmware and only then I will be able to relock it? Or maybe I can use the stock backup on any firmware, because TA doesn't change? In other words, can I relock the bootloader on other ROM than stock?
WoJtOn said:
I think you didn't fully understand the first question. Can I backup TA of my current firmware and then use that back up to relock bootloater WITHOUT changing it back to the stock 15.1.C.2.8? Or do I HAVE to roll back to stock firmware and only then I will be able to relock it? Or maybe I can use the stock backup on any firmware, because TA doesn't change? In other words, can I relock the bootloader on other ROM than stock?
Click to expand...
Click to collapse
I think i answered:laugh: haha.
It is recommended to be on stock. I wouldn't try it with custom rom due to the possibility of hard brick.
I decided to unlock it, then im stuck in bootloop... At first it says failed, then after i press it again, it says succrss, but i got a bootloop...
What causing this problem?
AndreIrawan97 said:
I decided to unlock it, then im stuck in bootloop... At first it says failed, then after i press it again, it says succrss, but i got a bootloop...
What causing this problem?
Click to expand...
Click to collapse
When you unlock the bootloader via sony's official way (using fastboot mode) your security related contents (DRM keys) in trim/TA partition gets erased and you will have access to install a new custom rom . But while unlocking is under progress, say for any reason it gets interrupted,there is a chance that all security related data might not be erased fully / In other words there is a chance that TA partition might have been corrupted
Usually when your phone boots its verifies for the intactness of TA/Trim partition, either it should have all security data (locked bootloader) or fully erased security related data (unlocked bootloader), if partial security information is available, it considers that TA partition has been tampered and will refuse to boot
gokukaushik said:
When you unlock the bootloader via sony's official way (using fastboot mode) your security related contents (DRM keys) in trim/TA partition gets erased and you will have access to install a new custom rom . But while unlocking is under progress, say for any reason it gets interrupted,there is a chance that all security related data might not be erased fully / In other words there is a chance that TA partition might have been corrupted
Usually when your phone boots its verifies for the intactness of TA/Trim partition, either it should have all security data (locked bootloader) or fully erased security related data (unlocked bootloader), if partial security information is available, it considers that TA partition has been tampered and will refuse to boot
Click to expand...
Click to collapse
So.... How to properly unlock it? And what should i do if i got a bootloop again?
AndreIrawan97 said:
So.... How to properly unlock it? And what should i do if i got a bootloop again?
Click to expand...
Click to collapse
Right now if you are able to boot into your phone, leave it, you have already unlocked/relocked it. If you are in the same situation again,
Steps
1) Relock your bootloader via flashtool
2) Now flash a fully bundled sony official ftf via flashtool.(This will ensure that if any discrepencies in TA partition are there, will be corrected)
Note: This will not restore your DRM keys.I am afraid if you have not backed up your DRM keys during first unlocking trail.they are lost.
3) Follow sony's official bootloader unlock method (www.developer.sonymobile.com/unlockbootloader/unlock-yourboot-loader)
gokukaushik said:
Right now if you are able to boot into your phone, leave it, you have already unlocked/relocked it. If you are in the same situation again,
Steps
1) Relock your bootloader via flashtool
2) Now flash a fully bundled sony official ftf via flashtool.(This will ensure that if any discrepencies in TA partition are there, will be corrected)
Note: This will not restore your DRM keys.I am afraid if you have not backed up your DRM keys during first unlocking trail.they are lost.
3) Follow sony's official bootloader unlock method (www.developer.sonymobile.com/unlockbootloader/unlock-yourboot-loader)
Click to expand...
Click to collapse
So... Can i just restore TA and unlock it? Because i have a TA backup
AndreIrawan97 said:
So... Can i just restore TA and unlock it? Because i have a TA backup
Click to expand...
Click to collapse
Good that you had a TA backup before unlocking.If you restore your TA backup and unlock it again , it will again erase your security keys, which will lead you to where you started.What is your requirement . Unlock your bootloader only if you want to install a custom rom. Believe me, TA partition is not the one to be played with; it can even render your mobile into a costly paper weight(hardbrick), if it gets messed up pretty bad . If you are already unlocked do not try to restore your TA partition,and unlock again.Its already unlocked and doesnt make any sense to unlock it again ; Restore it only when you want to go back to a locked bootloader.
Hi...I have experia m dual Android 4.3 c2004 with 15.5.A.1.5
I have already rooted with towelroot successfully.
But I am not able to use link2sd or foldermount etc.
So I want to unlock bootloader now...
So please give me link for a best step by step tutorial to backup Ta and unlock bootloader...for my above firmware...
pls help me...thanks.
Before you start you will need to check if your bootloader is unlockable. To do this, open your phonepad/dialer and type *#*#7378423#*#*. Tap service info and then configuration. Look to rooting status, there you will find a string of text what reads "Bootloader unlock allowed:" if it says yes then you can unlock your bootloader (and I will help you to unlock it as much as I can), however if it says no there is no way to unlock it.
gamer649 said:
Before you start you will need to check if your bootloader is unlockable. To do this, open your phonepad/dialer and type *#*#7378423#*#*. Tap service info and then configuration. Look to rooting status, there you will find a string of text what reads "Bootloader unlock allowed:" if it says yes then you can unlock your bootloader (and I will help you to unlock it as much as I can), however if it says no there is no way to unlock it.
Click to expand...
Click to collapse
Thanks Bro... I checked...and bootloader unlock allowed = Yes
Now I think I can proceed...pls tell me step by step to take Ta partition backup and unlock bootloader.
And may I know I will able to move to sd after unlock? or not?
thanks.
Amirphp said:
Thanks Bro... I checked...and bootloader unlock allowed = Yes
Now I think I can proceed...pls tell me step by step to take Ta partition backup and unlock bootloader.
And may I know I will able to move to sd after unlock? or not?
thanks.
Click to expand...
Click to collapse
Backup TA partition
How to unlock bootloader with flashtool
How to unlock bootloader with command prompt