I've seen multiple threads on rooting the device both here and on other sites and all of them conveniently leave out mentioning the fact that you're irreversibly ****ed if you don't backup your DRM keys first.
With DRM keys, I find the thread for Backup TA only to be told the tool is no longer maintained, and I haven't come across anything else that's similar.
The instructions for Backup TA say that you need the device to be rooted in order to perform a backup. If I understand correctly, rooting requires unlocking the bootloader first - and doing that will invalidate the keys, so epic Catch 22 right there.
And yes, I know that this question has been asked before, but I'm looking to see if there is anything new as of today, i.e. July 2nd 2015 that is specifically applicable to the very latest firmware. So is it possible to root the device without losing DRM keys or having to downgrade to last year's firmware first?
If you download an app called "kingroot" I think, you will be able to root on the latest firmware, however, there are roumors who says that this method sends your IMEI to a company in Japan or China or something.
Sent from my D6503 using XDA Free mobile app somewhere in Norway
You could just download some older firmware, install it without unlocking the bootloader. Then root the device using some other method (because on older firmware there were exploits available) and backup the TA partition (DRM keys) right away. Then you're able to wipe the device again, install the latest LP firmware and be happy with a backup
KaiserSnorezay said:
I've seen multiple threads on rooting the device both here and on other sites and all of them conveniently leave out mentioning the fact that you're irreversibly ****ed if you don't backup your DRM keys first.
With DRM keys, I find the thread for Backup TA only to be told the tool is no longer maintained, and I haven't come across anything else that's similar.
The instructions for Backup TA say that you need the device to be rooted in order to perform a backup. If I understand correctly, rooting requires unlocking the bootloader first - and doing that will invalidate the keys, so epic Catch 22 right there.
And yes, I know that this question has been asked before, but I'm looking to see if there is anything new as of today, i.e. July 2nd 2015 that is specifically applicable to the very latest firmware. So is it possible to root the device without losing DRM keys or having to downgrade to last year's firmware first?
Click to expand...
Click to collapse
You have it confused. Rooting using exploits like towel root or kingroot doesn't unlock your bootloader and you dont loose your DRM keys. If you want to unlock your bootloader you will have to goto Sony website and type in your IMEI and follow a procedure.
Try the steps mentioned in this link, it'll help you root your phone without unlocking your boot loader. Once you have root and recovery, you can go to recovery and backup only the TRIM Area which is the TA partition.
http://forum.xda-developers.com/xperia-z2/development/stock-d6502-6503-23-1-1-28-complete-t3104145
Related
I'll try and keep this short and to the point.
Currently running stock .290 firmware and wanting to root it, preferably without flashing a pre-rooted firmware, and without losing DRM keys.
Now if i want to root it according to this thread, i will need to unlock the Bootloader first:
"You'll have to unlock the bootloader if you want to root the .290 firmware (Android 4.3)."
and then root it via this, before i can run TA Backup to backup my DRM keys
What I'm confused about though, is that once the Bootloader is unlocked I lose my DRM Keys (as per this thread, and many other comments)
"The TA partition contains all your DRM keys for the Bravia/X-Reality Engine.
The first time you mess with your phone by unlocking the bootloader, these DRM keys will be deleted!"
The general consensus with regards to the proper order is:
1. Root
2. TA backup
3. Unlock bootloader
However for .290 it seems to be:
1. Unlock bootloader
2. Root
3. TA backup (if there is even anything left to backup?)
I guess what I'm wondering is if there is anyway to root .290 directly without first unlocking the Bootloader (and thus losing my DRM Keys), and without flashing pre-rooted firmware?
Or do i have this completely wrong, and by unlocking my Bootloader first, I won't lose my DRM Keys (contrary to what the linked thread above says)?
Thanks!
djyoshii said:
I'll try and keep this short and to the point.
Currently running stock .290 firmware and wanting to root it, preferably without flashing a pre-rooted firmware, and without losing DRM keys.
Now if i want to root it according to this thread, i will need to unlock the Bootloader first:
"You'll have to unlock the bootloader if you want to root the .290 firmware (Android 4.3)."
and then root it via this, before i can run TA Backup to backup my DRM keys
What I'm confused about though, is that once the Bootloader is unlocked I lose my DRM Keys (as per this thread, and many other comments)
"The TA partition contains all your DRM keys for the Bravia/X-Reality Engine.
The first time you mess with your phone by unlocking the bootloader, these DRM keys will be deleted!"
The general consensus with regards to the proper order is:
1. Root
2. TA backup
3. Unlock bootloader
However for .290 it seems to be:
1. Unlock bootloader
2. Root
3. TA backup (if there is even anything left to backup?)
I guess what I'm wondering is if there is anyway to root .290 directly without first unlocking the Bootloader (and thus losing my DRM Keys), and without flashing pre-rooted firmware?
Or do i have this completely wrong, and by unlocking my Bootloader first, I won't lose my DRM Keys (contrary to what the linked thread above says)?
Thanks!
Click to expand...
Click to collapse
No.
You need to downgrade to 532 root, backup ta, unlock bootloader then update.
Sent from my C6833 using XDA Premium 4 mobile app
SpyderTracks said:
No.
You need to downgrade to 532 root, backup ta, unlock bootloader then update.
Sent from my C6833 using XDA Premium 4 mobile app
Click to expand...
Click to collapse
Seems I'm really left with no option then.
In that case, are DRM keys linked to the hardware or firmware? In other words, by flashing the pre-rooted firmware will i still keep my original DRM keys? Or will I have new DRM keys, belonging/linked to said pre-rooted firmware?
djyoshii said:
Seems I'm really left with no option then.
In that case, are DRM keys linked to the hardware or firmware? In other words, by flashing the pre-rooted firmware will i still keep my original DRM keys? Or will I have new DRM keys, belonging/linked to said pre-rooted firmware?
Click to expand...
Click to collapse
AFAIK, it's only connected to xreality and a couple of other bits. More importantly it does have an effect on some streaming apps like netflix which will only work with drm. Think there may be a workaround for that on xda somewhere.
Also, if you lose drm and cannot restore the ta partition in event of breakage, then warranty is void.
Worth backing up I'd say if only for warranty purposes.
Sent from my C6833 using XDA Premium 4 mobile app
Like Spyder says, downgrade to 532 with Flashtool (no root or anything is needed), root it (it's very simple), backup TA (even simpler), unlock your bootloader, update to 290 again and root it (it's pretty simple with an unlocked bootloader).
If you regret it all and you want to re-lock the bootloader, be sure to be on a stock ROM with stock kernel and restore TA with the same tool you used to back it up with. This will also re-lock the bootloader. If you re-lock it on a custom kernel, your Ultra will not function. It will not reboot, and all you'll be left with is a blinking red LED over the screen. IF this happens, be sure to unlock the bootloader again, and it'll boot normally again.
You only have to backup the TA partition once, so if you choose to restore it and you want to unlock the bootloader yet again down the road, then just unlock it. You have the DRM keys, so you're safe. Be sure to back them up in the cloud too (Drive, Dropbox etc.) in case your computer crashes or you simply forget the DRM keys are there.
I wrote a guide on all this stuff, so take a look at it here.
You'll need to follow:
- Downgrading
- Rooting
- Backup TA Partition
- Unlocking the bootloader
After that, just download a 290 FTF and repeat step one (downgrading, but only with 290). Then when you're on 290, follow the guide you've already found. You can also flash Recovery/TWRP by following the short "Recovery and TWRP" section.
Good luck!
In xperia z2, is any security system against root like the knoxx of samsung? Which has a counter and void the warranty?
If not, the root void the warranty?
And the last question. There is already the root for version 4.4 with unlocked bootloader?
blackimera said:
In xperia z2, is any security system against root like the knoxx of samsung? Which has a counter and void the warranty?
If not, the root void the warranty?
And the last question. There is already the root for version 4.4 with unlocked bootloader?
Click to expand...
Click to collapse
No need, xperia security is among the hardest to crack, not happened at all since 2011 and only 1 person ever did in 2011
It can be rooted eaisly but as said security isnt a problem with root or modding or bootloader unlock.
Root and bootloader unlock voids warrenty but you can reinstate your warrenty by backing up your TA before unlocking bootloader
You can unroot and restore your TA later
Xperias can be restored to a 100% factory state, there are no flash counters or anything of that sorts
Any questions... Just ask
Envious_Data said:
No need, xperia security is among the hardest to crack, not happened at all since 2011 and only 1 person ever did in 2011
It can be rooted eaisly but as said security isnt a problem with root or modding or bootloader unlock.
Root and bootloader unlock voids warrenty but you can reinstate your warrenty by backing up your TA before unlocking bootloader
You can unroot and restore your TA later
Xperias can be restored to a 100% factory state, there are no flash counters or anything of that sorts
Any questions... Just ask
Click to expand...
Click to collapse
What is TA? And how i can backup it?
Sorry, I'm a newbie in this area ...
I searched for index topics, but i don't found ... There is here a simple tutorial on how to root the z2? And installing TWRP mode or clockwork (I think that's how you write it).
blackimera said:
What is TA? And how i can backup it?
Sorry, I'm a newbie in this area ...
I searched for index topics, but i don't found ... There is here a simple tutorial on how to root the z2? And installing TWRP mode or clockwork (I think that's how you write it).
Click to expand...
Click to collapse
1. TA partition contains drm keys and other unique numbers to your device (these existing upholds your warrenty and upholds some xperia features such as X-Reality and PS4 remote play)
This link you can use this tool to backup TA but you need to root first
http://forum.xda-developers.com/showthread.php?t=2292598
2. Root via root tools (general section or development sections) (this depends on firmware version blah.bla.314 firmware or before is rootable with locked bootloader
3. Cwm or twrp requires a unlocked bootloader however if you have root you can install [NUT]'s dual recovery
I've had my z2 for two days now and previously flashed my HTC one XL so I'm not super new but still pretty green with it all. Will it matter being an Australian phone for the root etc? I don't plan on flashing a rom at the moment I'm pretty happy with the stock firmware
Cheers
I am a rookie with these things and I would like to get some clarification.
I want to root my tablet, I am very satisfied with it and its system, all I need is to root it without touching my bootloader and drm keys. There are so many threads about it claiming its possible without unlocking the BL and I am not sure which tutorial should I use to root my device.
My device is LTE version, nothing modified and firmware is 23.0.1.A.0.16.
HenrichGrinch said:
I am a rookie with these things and I would like to get some clarification.
I want to root my tablet, I am very satisfied with it and its system, all I need is to root it without touching my bootloader and drm keys. There are so many threads about it claiming its possible without unlocking the BL and I am not sure which tutorial should I use to root my device.
My device is LTE version, nothing modified and firmware is 23.0.1.A.0.16.
Click to expand...
Click to collapse
you can try Towelroot as I see Z3TC is supported but I didnt test it on my tablet
where did you see that z3tc is supported by towel ? i can't find a device list or so.
HenrichGrinch said:
I am a rookie with these things and I would like to get some clarification.
I want to root my tablet, I am very satisfied with it and its system, all I need is to root it without touching my bootloader and drm keys. There are so many threads about it claiming its possible without unlocking the BL and I am not sure which tutorial should I use to root my device.
My device is LTE version, nothing modified and firmware is 23.0.1.A.0.16.
Click to expand...
Click to collapse
There is only one method at this time to get root on this tablet and this method involves unlocking your bootloader after doing a backup of you DRM keys (TA partition). Once you rooted your device with the unlocked bootloader you can reflash the TA partition and the bootloader will be locked again with all DRM keys intact as if you never unlocked it in the first place, but with root. Towelroot is not supported as the kernel exploit that was used is patched since nearly half a year now.
When i originally unlocked the bootloader I had backed up my TA partition.
Now I have a question, can I restore my drm keys from it since im on another version of lollipop?
Sent from my D6503 using XDA Free mobile app
Drm keys are Android version independent. So the answer is yes, you can restore them.
However it's good to remember some rules before restoring; it will also relock your bootloader so, if you have unauthorized software inside your phone by Sony, like a recovery or a custom ROM, your phone will NOT boot as they are normally designed to work with unlocked bootloader.
You should do a backup before proceed or make sure you are on a nin-custom Sony firmware.
Sent from my D6503 using XDA Free mobile app
_delice_doluca_ said:
Drm keys are Android version independent. So the answer is yes, you can restore them.
However it's good to remember some rules before restoring; it will also relock your bootloader so, if you have unauthorized software inside your phone by Sony, like a recovery or a custom ROM, your phone will NOT boot as they are normally designed to work with unlocked bootloader.
You should do a backup before proceed or make sure you are on a nin-custom Sony firmware.
Sent from my D6503 using XDA Free mobile app
Click to expand...
Click to collapse
Excuse me I ment im on another version of Android*, From your answer I understood I cant restore that.. So what are my options for restoring them?
Sent from my D6503 using XDA Free mobile app
As I understand, the DRM keys are not reliant on your Android version. So keys from 4.4.4 should work on 5.0.2 as they shouldn't change. I'm pretty sure envious_data has confirmed this (please correct me if I'm wrong).
HOWEVER, restoring them will relock the bootloader. If you are on a non-sony custom ROM (so CM, AOSP, etc) the phone will not boot (eXistenZ, Moonwalker (I think), and other stock based ROM's will however).
Stock based ROM's will ONLY boot if you have a stock kernel (which is found inside of the ftf file), any custom kernel (advanced stock, AndroPlus, any CM/AOSP, any other stock based kernel) kernels will not.
A locked bootloader recovery will not prevent the phone from booting, as it is on the /system partition and not inside of a kernel.
Also, if you have a recovery installed to the FOTAKernel partition, restore that to stock as that will prevent the phone from booting. The stock FOTAKernel file can be found in the ftf file too. If needed I can strip an ftf file down to stock kernel and FOTAKernel to be flashed.
CosTuMe said:
Excuse me I ment im on another version of Android*, From your answer I understood I cant restore that.. So what are my options for restoring them?
Sent from my D6503 using XDA Free mobile app
Click to expand...
Click to collapse
You can restore your DRM keys on any android version but you must make sure you'r completely on a stock build. (No custom kernals)
Deleted.
whats the procedure for restoring them?
CosTuMe said:
whats the procedure for restoring them?
Click to expand...
Click to collapse
If you used the BackupTA tool (or whatever it is called, it's in the cross device section) use the restore function in that.
But before you do, make sure you are on a stock based ROM, with a full stock kernel and full stock FOTAKernel partition.
gamer649 said:
If you used the BackupTA tool (or whatever it is called, it's in the cross device section) use the restore function in that.
But before you do, make sure you are on a stock based ROM, with a full stock kernel and full stock FOTAKernel partition.
Click to expand...
Click to collapse
Ok, i had done it(and the phone boots). is there anyway to check i got them back?
CosTuMe said:
Ok, i had done it(and the phone boots). is there anyway to check i got them back?
Click to expand...
Click to collapse
Open the phone dialer, *#*#7378423#*#*, Service Tests, Security, and then look to each row. Each one will be followed by [KEY OK][ACTIVE].
Also, to check the bootloader is relocked.
Open the phone dialer, *#*#7378423#*#*, Service Info, Configuration, look to rooting status. It will say "Bootloader unlock allowed: Yes", instead of "Bootloader unlocked: Yes".
Thank you very much, I had succeeded restoring them
Sent from my D6503 using XDA Free mobile app
im currently on kitkat rom with full root and unlocked bootloader, and im planning to lock the bootloader. if i upgrade my phone to the latest official lolipop rom. can my phone lock the bootloader? can i get a new DRM key?
PS: i unlocked BL without backing the DRM keys so i lost it.
ulyshut said:
im currently on kitkat rom with full root and unlocked bootloader, and im planning to lock the bootloader. if i upgrade my phone to the latest official lolipop rom. can my phone lock the bootloader? can i get a new DRM key?
PS: i unlocked BL without backing the DRM keys so i lost it.
Click to expand...
Click to collapse
You can re-lock the bootloader without the DRM keys, however it will not restore them. You can use the bootloader unlock/re-lock function in flashtool to lock the bootloader again.
You can lock the bootloader on any android version, regardless of what version you unlocked it on. But if you didn't back up your DRM keys there is no way to get them back, they are lost forever unfortunately.
thanks for the reply, because my remote play access did not work when i rooted my phone . now based on the other thread, its about the DRM key and unlock BL that is causing the issue.
Steps to restore DRM keys?
Hey,
I want to just request some help about the DRM keys. I know more or less what to do since I have lost them in order to get root. As I have understood the steps go:
Backup all apps and whatnot
Flash stock ftf file from any version (wipe APPSLOG, CACHE, DATA) via Flashtool
Root using Easy Root Tool
Backup TA partition using this tool
Push dual recovery into phone using NUTs Dual Recovery script
Restore TA partition using the tool above
And hopefully I would have Root with working keys? I am currently getting the 17.1.2.A.0.314 & 17.1.1.A.0.402 ftf firmware. If I am missing anything from the steps above please inform me.
Thanks ^^
.
suenoromis said:
Hey,
I want to just request some help about the DRM keys. I know more or less what to do since I have lost them in order to get root. As I have understood the steps go:
Backup all apps and whatnot
Flash stock ftf file from any version (wipe APPSLOG, CACHE, DATA) via Flashtool
Root using Easy Root Tool
Backup TA partition using this tool
Push dual recovery into phone using NUTs Dual Recovery script
Restore TA partition using the tool above
And hopefully I would have Root with working keys? I am currently getting the 17.1.2.A.0.314 & 17.1.1.A.0.402 ftf firmware. If I am missing anything from the steps above please inform me.
Thanks ^^
Click to expand...
Click to collapse
If you unlocked your BL before making backup of TA your keys are lost FOREVER .
Even if you downgrade and start everything again you won't get the keys back as they were unique to your device. If you don't have a TA backup of your keys don't waste time downgrading...
But if you DO HAVE A WORKING TA backup with YOUR keys then downgrade to 4.4.2, root, restore your TA (BL will get locked in the process), install dual recovery and upgrade to a pre-rooted firmware. You'll still have your keys and BL locked.
Steps to restore DRM keys?
ptmaniac said:
If you unlocked your BL before making backup of TA ..... You'll still have your keys and BL locked.
Click to expand...
Click to collapse
So there's absolutely no way to get the keys back after unlocking the bootloader?
What about this?
_delice_doluca_ said:
Drm keys are Android version independent. So the answer is yes, you can restore them.
However it's good to remember some rules before restoring; it will also relock your bootloader so, if you have unauthorized software inside your phone by Sony, like a recovery or a custom ROM, your phone will NOT boot as they are normally designed to work with unlocked bootloader.
You should do a backup before proceed or make sure you are on a nin-custom Sony firmware.
Click to expand...
Click to collapse
suenoromis said:
So there's absolutely no way to get the keys back after unlocking the bootloader?
What about this?
Click to expand...
Click to collapse
Confused about what? you are overcomplicating things.
You can get your keys back ONLY if you have a backup of your TA BEFORE unlocking your bootloader.
DID YOU BACKUP YOUR TA BEFORE UNLOCKING YOUR BOOTLOADER?
If you answer YES --> you can restore your keys
If you answer NO --> they are lost forever.
SImple.
suenoromis said:
So there's absolutely no way to get the keys back after unlocking the bootloader?
What about this?
Click to expand...
Click to collapse
Sorry, If I got things complicated. Let me explain it in scenerios and steps;
Small İnfo first; there is a small partition (or a small and untouchable part inside of a partition) in our phones. It contains and "device-specific" keys, basically an ID.
Some Sony-made softwares (like a picture or sound enhancer which are activated when user starts a music or takes a picture) are patent protected and search for these keys before run. If keys are not there user still can take a picture or listen to music however the patented enhancing software will not kick in. So how do you lose the keys? Why is Sony making this?
Because they want to protect their patented technology from being exposed to inspections or non-Sony users. So basically they tell you if you "unlock your bootloader" you will be able to do anything with your phone freely but the keys-including-partition will be wiped forever and those patented software addings will not run.
Let's get to scenerios.
1th Scenerio: You want to install custom kernel, recovery or ROM to your device? You have to unlock bootloader and it is simple. But doing this basically will wipe your keys and they will be gone forever.
2nd Scenerio: The device can be rooted without unlocking its recovery (very clever Sony, you think about protecting your patent and invent the "keys partition" and lock them to bootloader and get rooted that easily). Once we obtain root, we can read and write to any partition, including the one with the keys (it is called Trim Area). Once we are rooted, with FlashTool, we can backup the TA partition and protect the keys on our PCs.
"After the backing up", once we unlock the bootloader the phone will wipe TA partition but we will have a backup of them on our PCs.
With that backup on our PCs, we can safely do whatever we want; install custom ROMS, kernels, recoveries etc. (actually, there is even a recovery installation possible with "locked bootloader" ) and once we need to claim our warranty or want Sony-patented software enhancements, we can simply restore the TA partition (again with FlashTool).
Hey guys,
I own a stock Xperia Z3 Tablet LET (SGP621) and I have never upgraded it, still running stock 4.4.4.
I want to root it and only root (to Lolipop). I have read topics but there are so many and written in strange language for me I have no idea where to start.
I read I could just flash prerooted ROM without even touching my drm keys, right? But then I was not sure how could I do it.
Any help would be appreciated.
Thanks!
There is no method to root the tablet without unlocking the bootloader. The root exploit which most of the guys mentioning in these strangely written topics (giefroot, easy root tool, geohot, blablabla...) is useless now since Sony surely patched it. So to root, you have to unlock the bootloader. But wait, you would loose the DRM keys.
So, it means that you need to make a backup.
But, without root you can't backup.
But, how should you root if you don't have an unlocked bootloader??? And it goes on and on and on and on....
The "trick" is to flash a firmware from another device (not z3 tablet compact) that can be rooted via the exploit. But nobody wanta to use the "other" firmware to gain root. This "other" firmware is only used to gain root temporary so you can backup the drm keys.
Then you likely have to flash back the stock firmware (and root will be lost again).
Now that you backed up the drm keys, you are ready to unlock the bootloader and let the drm keys disappear for a while.
And then you still have to do some complex steps to achieve root on your stock firmware, then restore drm keys (bootloader locks up itself again...), blablabla
TL;DR forget rooting this device unless you are ready to do all these above steps. If you don't understand the steps and are new to rooting sony devices, I recommend you not to root and enjoy the stock firmware. Next thing is that lollipop will come and you could easily update without problems (via OTA). Until then, wait for some magicians/hackers/crackers find a new exploit which can root 2015 sony devices without unlocking the bootloader.
If you want to know if your device (firmware) can be rooted via exploit, try xdualrecovery. It contains the exploit root method. But if you are unsuccessful flashing xdualrecovery, that is because the exploit doesn't work and your firmware is patched.
Sadly, sony devices are nothing like nexus. And including this "afraid of loosing the drm keys", simply unlocking the bootloader might not be a pleasing thing to do.
just to add maybe we don't need to unlock bootloader to root our tablet
we temporarely flash z3 kitkat system to get a rootable core and we flash again z3 tablet compact system before reboot
or so I understood
ChiDi9901 said:
There is no method to root the tablet without unlocking the bootloader (false, there is a method detailed in this thread). The root exploit which most of the guys mentioning in these strangely written topics (giefroot, easy root tool, geohot, blablabla...) is useless now since Sony surely patched it. So to root, you have to unlock the bootloader. But wait, you would loose the DRM keys.
So, it means that you need to make a backup.
But, without root you can't backup.
But, how should you root if you don't have an unlocked bootloader??? And it goes on and on and on and on....
The "trick" is to flash a firmware from another device (not z3 tablet compact) that can be rooted via the exploit. But nobody wanta to use the "other" firmware to gain root. This "other" firmware is only used to gain root temporary so you can backup the drm keys (false, the other firmware is used to gain root and then install a custom recovery, so you can flash a prerooted and updated lollipop firmware based on official Xperia Z3 Tablet Compact firmware).
Click to expand...
Click to collapse
I would advise not to answer questions about root without understanding the process and/or misguiding people asking for help.
The information you give above is wrong. You don't need to unlock your bootloader provided you downgrade to an explotable firmware.
The thread that details how to root your Xperia Z3 Tablet Compact is this one:
http://forum.xda-developers.com/z3-...to-rooted-lollipop-locked-bootloader-t3083980
1. Obtain root by first flashing SGP621_23.0.1.A.0.167_CE.ftf and the system partition of D6603_23.0.A.2.93_Generic_20GLOBAL.ftf. Then use giefroot to root.
2. Prepare prerooted flashable zip of 23.1.A.0.690 NOBA on your internal storage or external SD.
3. Install XZDualRecovery and now you will have TWRP to install 23.1.A.0.690 NOBA on your SD card.
You may ask any doubts in that thread.
BarajaVLC said:
I would advise not to answer questions about root without understanding the process and/or misguiding people asking for help.
The information you give above is wrong. You don't need to unlock your bootloader provided you downgrade to an explotable firmware.
The thread that details how to root your Xperia Z3 Tablet Compact is this one:
http://forum.xda-developers.com/z3-...to-rooted-lollipop-locked-bootloader-t3083980
1. Obtain root by first flashing SGP621_23.0.1.A.0.167_CE.ftf and the system partition of D6603_23.0.A.2.93_Generic_20GLOBAL.ftf. Then use giefroot to root.
2. Prepare prerooted flashable zip of 23.1.A.0.690 NOBA on your internal storage or external SD.
3. Install XZDualRecovery and now you will have TWRP to install 23.1.A.0.690 NOBA on your SD card.
You may ask any doubts in that thread.
Click to expand...
Click to collapse
Well, the OP (junior member) mentioned "strange languages". So he/she might not understand all this complex steps. That's why I "let it be" to keep the things easy. If he/she understands these steps then it's good for him/she. But you're right, I lied. And thanks for the clarification and pointing out my wrong information.
Personally, I had every Xperia unlocked without backing up the DRM keys. I never had any disadvantage. I was, however, a little reluctant with the XT3C. That's because I use it as both my phone and tablet.
Still, did it now. No adverse effects. Root is SO much more important than the Bravia engine or whatever. And the camera isn't very good anyway so I don't miss the 'better' quality. It's bad either way