[Q][Z2]Relock/unlock Bootloader - Xperia Z2 Q&A, Help & Troubleshooting

Hello.
I have wondered about unlocking bootloader and go over to CM on my Xperia Z2.
But before i do so, i want to clear up some things first.
Is there a way to relock bootloader on my phone?
Will I be able to unlock after I have relocked? (using official metod)
Backing up TA, will it store my DRM-keys and make it possible to get them back after locking bootloader again?
I want to do this because im currently using CM on my Mini Pro, and i want to try it on my Z2. And I want to be able to get back to stock when the L is out for Z2.
If someone can answer my questions, or point me to the right direction, I would be much happy.

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bjorn96 said:
Hello.
I have wondered about unlocking bootloader and go over to CM on my Xperia Z2.
But before i do so, i want to clear up some things first.
Is there a way to relock bootloader on my phone?
Will I be able to unlock after I have relocked? (using official metod)
Backing up TA, will it store my DRM-keys and make it possible to get them back after locking bootloader again?
I want to do this because im currently using CM on my Mini Pro, and i want to try it on my Z2. And I want to be able to get back to stock when the L is out for Z2.
If someone can answer my questions, or point me to the right direction, I would be much happy.
Click to expand...
Click to collapse
1. Yes, using flashtool, other methods i dont know of
2. Yes
3. Drm keys are in TA partition so backup your Ta and restore later (restoring relocks bootloader so flash stock kernel before doing so)
4. Relocking bootloader doesnt bring back drm keys
5. Its safe to restore TA over a locked bootloader
6. You can only restore TA or relock bootloader on a stock kernel

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Answers to your queries :
1) Yes, you can relock it once it is unlocked. Restoring TA partition will also relock your bootloader.
2) Yes you can.. You need to have the oem unlock key which you have received from Sony while unlocking for the first time.
3) Yes
Please read this thread : http://forum.xda-developers.com/showthread.php?t=2440597

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Envious_Data said:
1. Yes, using flashtool, other methods i dont know of
2. Yes
3. Drm keys are in TA partition so backup your Ta and restore later (restoring relocks bootloader so flash stock kernel before doing so)
4. Relocking bootloader doesnt bring back drm keys
5. Its safe to restore TA over a locked bootloader
6. You can only restore TA or relock bootloader on a stock kernel
Click to expand...
Click to collapse
OK, thanks for the quick answer.
Here is a short of what I understand now. Correct me if its wrong.
Using this tool, I can backup and restore TA.
When restoring TA, it will lock bootloader automatically.
To restore TA, I have to download and flash stock ROM for Z2 (Nordic in my case), and that should be ok to use XPERIFirm to download?
When done restoring TA, I dont have to do more than wait for L to come to me??
I hope this is right, in that case I might give it a try.
(I dont want to start something without planning a way out of it, thats why I ask.)

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bjorn96 said:
OK, thanks for the quick answer.
Here is a short of what I understand now. Correct me if its wrong.
Using this tool, I can backup and restore TA.
When restoring TA, it will lock bootloader automatically.
To restore TA, I have to download and flash stock ROM for Z2 (Nordic in my case), and that should be ok to use XPERIFirm to download?
When done restoring TA, I dont have to do more than wait for L to come to me??
I hope this is right, in that case I might give it a try.
(I dont want to start something without planning a way out of it, thats why I ask.)
Click to expand...
Click to collapse
3. Xperia firm, you can use flashtool to bundle the files into a FTF or you can see if someome has done already here...
http://forum.xda-developers.com/showthread.php?t=2759934
Flash A FTF before restoring TA or relocking bootloader

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Envious_Data said:
3. Xperia firm, you can use flashtool to bundle the files into a FTF or you can see if someome has done already here...
http://forum.xda-developers.com/showthread.php?t=2759934
Flash A FTF before restoring TA or relocking bootloader
Click to expand...
Click to collapse
And the rest was ok??
Thanks man, now its all clear to me. :highfive:
Hope I will be back later tonight with CM on my phone. :fingers-crossed:

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bjorn96 said:
And the rest was ok??
Thanks man, now its all clear to me. :highfive:
Hope I will be back later tonight with CM on my phone. :fingers-crossed:
Click to expand...
Click to collapse
Yup
1. Root
2. Backup TA
3. Unlock bootloader
4. Install recovery
~wipe data n cache
5. Flash CM
6. Enjo
Simple as

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Envious_Data said:
Yup
1. Root
2. Backup TA
3. Unlock bootloader
4. Install recovery
~wipe data n cache
5. Flash CM
6. Enjo
Simple as
Click to expand...
Click to collapse
Thanks man.
Will report back when done.

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Envious_Data said:
Yup
1. Root
2. Backup TA
3. Unlock bootloader
4. Install recovery
~wipe data n cache
5. Flash CM
6. Enjo
Simple as
Click to expand...
Click to collapse
One more thing. The key for unlocking my bootloader, is it the same after locking it again???
Or do I have to ask Sony for a new one?

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bjorn96 said:
One more thing. The key for unlocking my bootloader, is it the same after locking it again???
Or do I have to ask Sony for a new one?
Click to expand...
Click to collapse
Same key

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I almost forgot to tell you. It worked!!! I ran into bootloop 3 times, but finally it worked. Thanks a lot man.
Sent from my Xperia Z2

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Envious_Data said:
Same key
Click to expand...
Click to collapse
Have you got an idea how to enable double tap to wake?? Cannot find it anywhere.

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if you have installed a custom rom like CM then the chances of the kernel not having the double tap to wake wont be there because its the kernel that will have it and not the rom . So if you do want it then you have to look for a kernel which has got the feature

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bjorn96 said:
Have you got an idea how to enable double tap to wake?? Cannot find it anywhere.
Click to expand...
Click to collapse
After installing m5 kernel, download m5 kernel settings, thats how you enable double tap to wake
It should show an option somewhere in the device settings now

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Can we unlock bootloader on phones that have been previously carrier locked or not yet?

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darkmage93 said:
Can we unlock bootloader on phones that have been previously carrier locked or not yet?
Click to expand...
Click to collapse
It depends on the carier and i do believe you can pay for sim unlock and a bootloader release

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Envious_Data said:
It depends on the carier and i do believe you can pay for sim unlock and a bootloader release
Click to expand...
Click to collapse
Already payed for sim unlock, the phone was locked to EE UK. Here's a SS to see what it says on rooting status. When i unlocked it, they provided me multiple codes, NCK, SPCK, NSCK, CCK. Is any of the codes for bootloader unlocking? If so, where do i type it? Cheers.
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My Z2 should be here on Tues, and I was going to unlock the BL, the directions above are very clear and straightforward. (I had a TMO XZ w/ an unlockable BL, so I know how the rom flashing goes) My question is do I have to use Nutz recovery, could i just fastboot flash recovery twrp.img and use Team Wins? Also for flashing a ROM do I need to use the FFT or can I just flash a rom the more traditional way say like a Nexus device? Thx guys, Im very green when it comes to Sony. Nexus, HTC, and Sammy are my staples. Thx again.

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Nut is mainly for locked bootloaders, once you've unlocked the bootloader flash a kernel such as dooms via adb then flash a rom from recovery ftfs are stock roms only any custom rom will have a flashable zip
Sent from my Xperia Z2 using Tapatalk

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So you can unlock the bootloader, then relock it, restore TA partition and it will be like you never had unlocked the bootloader? I mean, if you do that, your device will be able to recieve OTA (and all Sony's features like x-reality and better camera performance) and your warranty will be "restored"?