Backuping TA Partition on downgraded firmware - Xperia Z2 Q&A, Help & Troubleshooting

Hello, my D6503 is getting pretty old right now, so I decided to install some custom soft on it. I need to unlock my bootloader, so I read a lot about that DRM Keys and backuping TA. Now I have 23.4.A.1.232 and I'm going to downgrade it to 17.1.2.A.0.314 which is rootable. The question is: Can I do the backup of TA Partition on 4.4.2 (17.1.2.A.0.314) and potentially restore it on 5.1 or newer? Or do I have to upgrade rooted 4.4.2 to rooted 5.1 and then do the TA backup to avoid version-conflict?
Thank you in advance!

Ta backup of 4.4.2 would work fine bt still for extra safety backup the TA on 5.1

I have restored ta backups on both KK and LP versions (while the backup itself is taken on KK) without any problems.
The android version shouldn't matter

Related

[Q] Downgrading i9300 from 4.3 > 4.1.2

Hi guys. I just upgraded my GS3 from 4.1.2 to 4.3 and from the title, obviously I didn't like the upgrade .__.
Being a total noob and keeping my phone as simple as possible, I never rooted my phone. I did think of rooting it soon though (Just when the upgrade came. Sigh.)
After a bunch of problems: (can be omitted)
1) I couldn't use the GS3 Toolkit (from http://forum.xda-developers.com/showthread.php?t=1703488) cos my build was no longer 4.1.2. I do backups pretty often and I can't find any other backup programs that are easy to use.
2) Some of the widgets were gone.
3) Annoying settings ._.
I DID made a full backup. But it's not a NANDROID backup. Just a normal backup (.bak) file
I tried searching online to downgrade and there were a few questions I wanna make sure before diving into the downgrade process.
Q:
1) Especially when I don't have root, I saw some people saying their EFS being lost after downgrading http://forum.xda-developers.com/showthread.php?t=2640696 . I suppose have to root my 4.3 first then backup my EFS? After downgrading to 4.1.2, would my device still be rooted?
2) I shouldn't have to worry about my data being wiped because of the downgrade, right? Since I made a full backup for the 4.1.2, I can just restore my data back after I downgrade?
3) I see a lot of people talking about their phones BRICKING after downgrading few months ago. I suppose that's your phone breaking down. Would there any bricking problems if I follow this guide here? http://www.androidpit.com/how-to-downgrade-galaxy-s3
4) To be extra safe, I want to backup my apps (probably SMS, but not priority) again so I have 2 files just in case. I can't use Titanium cos I'm not rooted, any other suggestions? Or is it still recommended to root then backup then flash stock ROM?
danielkzlai said:
Hi
...
Click to expand...
Click to collapse
just open my thread(How to Recover....)
download the stock rom that you want, and flash it
details on that thread
i have a i9300 with 4.3 that is sim locked on a carrier from my country. as far as i know, there are no free methods to unlock 4.3, but i read that 4.1.2 can be unlocked at home for free, or at least with galaxsim (it's not free but it's cheap ~ 3 euros). but i read that it isn't possible to downgrade to an older rom (the phone will brick/bootloop), is that true? i also saw that alot of people lost their imei. is it safe to try downgrading if i make a efs backup?
UNDERSTAND FIRST
http://forum.xda-developers.com/showthread.php?t=2362743
Network IMEI EFS
http://forum.xda-developers.com/showthread.php?t=2393289
Downgrade and network problems .
http://forum.xda-developers.com/showthread.php?t=2531221

[Q] Currenty, no 5.0 Root available, correct?

Hi, I recently purchased the GPE Z Ultra on ebay. The seller upgraded it to 5.0 before sending it to me and so far so good. But I am coming from a Note 2, rooted & loaded with a custom ROM (Goodness). I really want to root the Z Ultra but not load any custom rom, don't need it really. I've been reading up in the forum & so far, it looks like I am out of luck in regards to rooting, is this correct? There is no root available for 5.0 & I most likely will not be able to downgrade, root & then update to 5.0, correct? I just want to make sure I understand the current status of root availability and my status (already upgraded to 5.0 & no access to TA from previous version). This is my first nonSamsung Android phone & the rooting/unlocking bootloader is quite new to me, so I'm trying to learn all I can. Thank you all!
Correct. Without unlocking the bootloader, there is no way to root Android 5.0 - previous root methods exploited Android system security holes as opposed to boot process security holes, and so far no one has identified any root access vulnerabilities in Android 5.0.
I'm currently running rooted stock 5.0 OTA, but upgrading was rather painful and my bootloader is unlocked, which is what allowed me to flash a rooted 5.0 system image in the first place. I have a locked TA backup from 4.4.4, but I'm afraid to attempt a relock with it.
Unfortunately, I think you're out of luck if you want to retain your TA partition. Darn chicken and egg problems... You can't backup the TA without root. If a Lollipop vulnerability is discovered, we're likely to hear about it soon afterwards... That's a big "if" though.
Thanks, that's what I thought but wanted to confirm I wasn't missing anything. Hopefully, some sort of exploit will be found. Still getting used to the new Lollipop/GPE version. I like it so far except for missing some additional settings/tweaks I could use via root.

Any kernel that we can restore our DRM to?

Hi i successfully rooted and backuped my TA, thanks to the guide written here. Unfortunately, the ending FW was for Z3 which really wasn't functional for my SGP621. I cannot revert to stock without losing root because it would overwrite kernel and system of the rooted FW now. My question is, is there a rooted stock kernel for unlocked BL where we can restore our DRM partitions and also maintain root at the same time?
infinitylook said:
Hi i successfully rooted and backuped my TA, thanks to the guide written here. Unfortunately, the ending FW was for Z3 which really wasn't functional for my SGP621. I cannot revert to stock without losing root because it would overwrite kernel and system of the rooted FW now. My question is, is there a rooted stock kernel for unlocked BL where we can restore our DRM partitions and also maintain root at the same time?
Click to expand...
Click to collapse
Mate, follow the instructions on this link and you can have a rooted stock rom with TA restored no problem.
(http://forum.xda-developers.com/z3-...-to-rooted-stock-sgp621-firmware-drm-t3015494)
To gain read/write you'll need to run this script.No need to follow all the instructions there, allow usb debugging and run the bat file.
(http://forum.xda-developers.com/xperia-z2/general/4-4-4-sony-ric-killer-t2953141)
frostmore said:
Mate, follow the instructions on this link and you can have a rooted stock rom with TA restored no problem.
(http://forum.xda-developers.com/z3-...-to-rooted-stock-sgp621-firmware-drm-t3015494)
To gain read/write you'll need to run this script.No need to follow all the instructions there, allow usb debugging and run the bat file.
(http://forum.xda-developers.com/xperia-z2/general/4-4-4-sony-ric-killer-t2953141)
Click to expand...
Click to collapse
Yeah already solved, mine
Sent from my SGP621 using XDA Free mobile app

[Q] Data loss on downgrade

Hey guys,
Do I lose all my data on a downgrade? (4.4.4 to 4.4.2) because I think it's just like a update, just the other way round.
Thanks in advance, _Heisenberg
_heisenberg said:
Hey guys,
Do I lose all my data on a downgrade? (4.4.4 to 4.4.2) because I think it's just like a update, just the other way round.
Thanks in advance, _Heisenberg
Click to expand...
Click to collapse
yes you will lose all the data. it not exactly an update. its more like a factory restore. if you dont select system while flashing than you might retain the data but it'll create other problems i think like FCs and such. if you want retain the data, like game progress and such i suggest you use helium app, it can backup entire data and restore it when you have flashed anything else. but if you gonna unlock your bootloader and flash a lollipop ROM than its not gonna help as file placement is different in lollipop, i dont know whether even titanium will help in that case, you might have to start completely from scratch.
kunaltyagii said:
yes you will lose all the data. it not exactly an update. its more like a factory restore. if you dont select system while flashing than you might retain the data but it'll create other problems i think like FCs and such. if you want retain the data, like game progress and such i suggest you use helium app, it can backup entire data and restore it when you have flashed anything else. but if you gonna unlock your bootloader and flash a lollipop ROM than its not gonna help as file placement is different in lollipop, i dont know whether even titanium will help in that case, you might have to start completely from scratch.
Click to expand...
Click to collapse
Okay, i just want to flash the downgrade for root and recovery, so I think there is no problem with it, is it? And if I downgrade, I think I am able to backup everything with Titanium Backup. Do you think that's possible?
_heisenberg said:
Okay, i just want to flash the downgrade for root and recovery, so I think there is no problem with it, is it? And if I downgrade, I think I am able to backup everything with Titanium Backup. Do you think that's possible?
Click to expand...
Click to collapse
You can root and then update using the PRFtool and you'll retain root,probably even after OTA you will retain root, but i've heard that it varies with different people, you may or may not retain root after simple OTA, also i'm not sure how much help titanium backup will be before rooting as it requires root for backup function, as i suggested, use helium app, no root required. keep the backup safe, flash the prf through recovery, the flash the baseband and kernel through the ftf, then you'll be on latest FW with root and then you can restore the data from helium backup.
Edit: just now understood, you meant use titanium after downgrading and rooting probably, you will lose all the data during downgrading, so nothing will be left after downgrading to backup. have to backup before downgrading.

drm restore

i have my ta keys backed up but noticed you cant relock a bootloader when using a custom kernel is there any other way to restore my drm functions without going back to stock (its a kernel to get root thats all)
i have fw build number 34.3.a.0.252 (reason i needed root is disable the update notification)
not according to this post
https://forum.xda-developers.com/xperia-xz/how-to/how-to-unlock-bl-kernel-twrp-root-t3541648

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