Problem unlock bootloader z3+ - Xperia Z4/Z3+ Q&A, Help & Troubleshooting

Hello, I have the sony xperia z3 + I unlocked the bootloader but the problem is that after I enabled sony Protection System, and do not want my bootloader unlocked whatever I do the phone works well, but for the bootloader I can not do anything ... I already tried tool studio flash and android nothing there ... I already thought envoy to sav but he will see that before I unlocked the bootloader ..I do not know what to do for the unlocked if you like it

english please. im interested to know further on this new protection method.

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[Q] Relock the Bootloader and others

ZR is my very first Android phone, so basically I know nothing about Android.
I unlocked the bootloader couple of weeks ago following the official Sony instructions in order to flash the stock Taiwan ROM (cause China's ROM doesn't support Google service). But now I found that I cannot update via Sony. More importantly, it's actually not necessary to unlock the bootloader for flashing ROM and/or get root privilege. So I'm desperately seeking the way to relock the bootloader.
I found some guy talking about flashing a small file called Xperia_Relock_bootloader.ftf. But he said that it was only for old models. Anybody here can help? Thanks in advance!
P.S. They said that after unlocking the boot loader, Bravia Engine and TrackID service will gone. But I have both working still. Weird. Does that mean I can backup my TA partition still?

[Q] Help: Sony Xperia Z1 says cannot unlock bootloader

How can I install a custom ROM without an unlocked bootloader?
My phone says its bootloader cannot be unlocked
Mine too , it's must to be a solution to unlock the bootloader...
No, there is no solution
If it says it cannot be unlocked then it cannot be unlocked
Look in the development section for stock based custom roms that can be installed with a locked bootloader
To my experience it needs to be sim unlocked first in order to be bootloader unlocked. In a Xperia Z it said it couldn't unlock bootloader, i purchased unlock code, got it unlocked and then reflashed stock image. After that the status on "bootloader unlock allowed" was changed to yes.
roobns said:
To my experience it needs to be sim unlocked first in order to be bootloader unlocked. In a Xperia Z it said it couldn't unlock bootloader, i purchased unlock code, got it unlocked and then reflashed stock image. After that the status on "bootloader unlock allowed" was changed to yes.
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Please provide proof of that, because this has never happened before and would be fantastic news
Also, some sim locked phones can have bootloaders unlocked and some sim free phones have bootloaders that cannot be unlocked. SO your logic is wrong.
gregbradley said:
Please provide proof of that, because this has never happened before and would be fantastic news
Also, some sim locked phones can have bootloaders unlocked and some sim free phones have bootloaders that cannot be unlocked. SO your logic is wrong.
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Click to collapse
Can't provide proof as 1) the bootloader was already unlocked 2) I don't even have the phone anymore.
I don't know if you find my logic right or wrong it was what happened to MY experience with one phone.
I'm pretty sure devs can give you a technical explanation about why it can or can't happen.
roobns said:
Can't provide proof as 1) the bootloader was already unlocked 2) I don't even have the phone anymore.
I don't know if you find my logic right or wrong it was what happened to MY experience with one phone.
I'm pretty sure devs can give you a technical explanation about why it can or can't happen.
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Click to collapse
OK thanks.
I know what the devs will say. They will say it cant happen. This has been talked about ad infinitum across various xperia devices.
Also, if your boot was already unlocked then how did you know the status changed?
Thanks anyway.
gregbradley said:
OK thanks.
I know what the devs will say. They will say it cant happen. This has been talked about ad infinitum across various xperia devices.
Also, if your boot was already unlocked then how did you know the status changed?
Thanks anyway.
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Click to collapse
When i got the phone (telcel mexico) it said the bootloader was not allowed to be unlocked.
I purchased an unlock code. Entered the code, unlocked the phone.
I flashed an upgraded FW via FTF
typed *#*#SERVICE#*#* and boom bootloader unlock statys changed to yes
That's how i know the status changed. So basically that's my story. I thought it could work with every device.
@gregbradley maybe the sim unlock method really works to change unlock bootloader status YES..bcs it works for some sony device, and we need to test this on Z1.
http://forum.xda-developers.com/showthread.php?t=1896553
There is nothing in that thread that confirms this. Plus the test point method to unofficially unlock the bootloader was stopped by Sony nearly 2 years ago.
But please, delve into this again if you want. But trust me it is a dead end and does not work. If it was easy as sim unlocking and flashing a ftf do you not think that would have been done by now.
Some seriously good devs have been working on this ever since the test point method was closed.
Sent from my C6903 using XDA Premium 4 mobile app

[Q] RE-UNLOCKING Bootloader

Hey friends, I have a Sony Xperia Z device. First, i unlocked it's bootloader, then i re-locked it using the TA-partition backup. But now I want to RE-UNLOCK the bootloader to install the new Android 5.0 and I don't know how to do it. Do i need to do it in the normal way?
AGLMarius said:
Hey friends, I have a Sony Xperia Z device. First, i unlocked it's bootloader, then i re-locked it using the TA-partition backup. But now I want to RE-UNLOCK the bootloader to install the new Android 5.0 and I don't know how to do it. Do i need to do it in the normal way?
Click to expand...
Click to collapse
follow the process from which u tried to unlock first time ,luckily Sony support official bootloader unlocking
http://m.youtube.com/watch?v=iIdJg7...ib290bG9hZGVy&client=mv-google&hl=en-GB&gl=IN

Rooting status: Unknown and DRM Keys are gone!

Hey guys I have an Xperia Z3+ and recently I faced some problems.
I really didn't know that unlocking the bootloader would erase my DRM keys. My camera doesn't even focus now and the image quality went to low.
I flashed a new rom (Android 5.0.2 - Vodafone UK) using flashtool hoping that I would get all my camera features back, but nothing happened.
There was this one time where I upgraded to android 6.0 from android 5.0.2 but still my camera was laggy and didn't focus. But I relocked my bootloader and unlocked it again.
My camera features were back!!! I could focus again and it worked.
But, right after two days my camera stopped focussing again...even after I thought I had fixed it.
When I dialled *#*#7378423#*#* to check if my bootloader was unlockable it said rooting status: unknown and thats the reason why I couldnt unlock the bootloader in the command window in fastboot mode (platform tools). Bootloader had automatically got locked...I have no idea how that happened.
Please, is there a way out of this mess? Or should I just throw away my phone? :crying: I don't know what to do...
flash android 6.0 back then follow this link and sub links
http://forum.xda-developers.com/xperia-z4/help/z3-drm-restore-t3302929
zemetal said:
flash android 6.0 back then follow this link and sub links
http://forum.xda-developers.com/xperia-z4/help/z3-drm-restore-t3302929
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Click to collapse
My rooting status: unknown I can't unlock my Bootloader without getting it to Bootloader unlock allowed: yes. Do you know a way to do that?
How to backup TA before unlocking bootloader? I am using Xperia Z3+ Dual..
dil2abu said:
How to backup TA before unlocking bootloader? I am using Xperia Z3+ Dual..
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A locked boatloader root is being worked on over the Z5 forums, you can expect it to support the Z3+ as well

xperia z1 c6903 cant unlock bootloader

good afternoon, I have a problem with my xperia z1 c6903 when unlocking the bootloader I get a message that says your phone can not be officially unlocked that I should thank.
Apparently Sony has blocked the ability to unlock the bootloader on certain devices.
This is most likely the case if you got your phone from your carrier. Do you have a branded Z1?
You can also look up if this is the case by doing the following:
1. Open dialler and enter *#*#7378423#*#*
2. Go to Service info > Configuration > Rooting Status.
3. "Bootloader unlock allowed" should say Yes
If it doesn't, then at least the official way of unlocking your device won't work.
Any "not official" way to unlock the bootloader? Mine is locked too and i want to install something new in that old one. Thanks in advance.
Mine says not posible but i read somewere that can be done
That's the thing, is an old smartphone today, i don't understand why only certains models can be unlocked. Now im on last oficial os (5.1.1). I get it root but i cant unlock the bootloader in any way.
wowegoo said:
That's the thing, is an old smartphone today, i don't understand why only certains models can be unlocked. Now im on last oficial os (5.1.1). I get it root but i cant unlock the bootloader in any way.
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Click to collapse
Fyrenic said:
Apparently Sony has blocked the ability to unlock the bootloader on certain devices.
This is most likely the case if you got your phone from your carrier. Do you have a branded Z1?
You can also look up if this is the case by doing the following:
1. Open dialler and enter *#*#7378423#*#*
2. Go to Service info > Configuration > Rooting Status.
3. "Bootloader unlock allowed" should say Yes
If it doesn't, then at least the official way of unlocking your device won't work.
Click to expand...
Click to collapse
hi is there any unofficial way to unlock it, i want to have freedom on choosing what rom to install, i'm having difficulties on finding a rom that works on the stock kernel. can you help?

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