Database Users

Understanding a Locked Bootloader

Alright so if updates are applied OTA and the updates need to be signed to be properly installed then the bootloader is already set to take a certain type of keys unless when you update ATT adds the next key for the next OTA in boot loader. But if there is a specific set of keys that are produced by a specific algorithm that the bootloader is already set to accept then all we would need to unlock a bootloader is that algorithm right? If we were to found out the algorithm ATT uses to created the keys that the bootloader accepts then we could replace the bootloader with an unlocked one

moyennes said:
Alright so if updates are applied OTA and the updates need to be signed to be properly installed then the bootloader is already set to take a certain type of keys unless when you update ATT adds the next key for the next OTA in boot loader. But if there is a specific set of keys that are produced by a specific algorithm that the bootloader is already set to accept then all we would need to unlock a bootloader is that algorithm right? If we were to found out the algorithm ATT uses to created the keys that the bootloader accepts then we could replace the bootloader with an unlocked one
Click to expand...
Click to collapse
I'm not sure if you're posting in the correct place. Unlocking the boot loader (on the LG G Watch, at least) can be done with fast boot oem unlock.

Smith7018 said:
I'm not sure if you're posting in the correct place. Unlocking the boot loader (on the LG G Watch, at least) can be done with fast boot oem unlock.
Click to expand...
Click to collapse
Works the same with the Gear Live.

sometimes bootoaders can be circumvented to load a custom kernel as well; It's rare to see but enough devices have it where these things happen semi-frequently

Bootloader Unlock Tip

Hey All,
I've seen some posts stating that the bootloader for this phone can't be unlocked.
I'm using the E6533 model and wanted to confirm that it is possible.
Just go to this website: http://developer.sonymobile.com/unlockbootloader/ (the official sony one)
Select Xperia Z3 as the model (I know we have the Z4/Z3+ but it still works). Enter your email and click the link they email you.
Insert the IMEI number and they will give you the unlock code. then just run
adb reboot bootloader
fastboot oem unlock <code>
and it will work.
As a note this WILL wipe your device, so backup anything you may need on it.
Hopefully with this we can get root / twrp built

So TA backup is needed to keep the DRM keys before unlocking the bootloader. Is there a way to back up TA of non-rooted devices? Flashtool doesn't fully support Z3+ yet.

help
Quick question , what to do if you have Unlock allowed: No?

Generally speaking this always meant just what it says... That it's not possible to unlock the bootloader. This was often the case with oem phones. Today it could also mean you have myxperia security activated. If you have log out of that and try again.
Oh and do not activate it after unlocking bootloader, you could brick your device for good!

3lastic said:
Quick question , what to do if you have Unlock allowed: No?
Click to expand...
Click to collapse
Make sure you don't have the xperia security software enabled (the find my iPhone equivalent)
It prevents the bootloader from being unlocked. Otherwise it means your carrier disabled the feature

Thanks diemadedrei and ChrisJ951.
It worked, it was the Xperia Security software that was enabled.

Rooting status: unknown
Hello, i tried to unlock my BL from the sony website, but after i flashed the code in my phone, it just restored and now just says rooting status: unknown and also the option of unlock allowed does not even appear! anybody could please help me?
thanks and hello from Mexico!

The z3+ is now selectable on the unlock page officially
@bryantronics: it should say bootloader unlocked yes under rooting status. Generally it should have worked if everything went as described.

diemadedrei said:
The z3+ is now selectable on the unlock page officially
@bryantronics: it should say bootloader unlocked yes under rooting status. Generally it should have worked if everything went as described.
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Click to collapse
hello! thanks for the reply, the bootloader said yes... but that line doesnt appear! it just says rooting status unknown, i tried to upload the screenshot but i dont know how to do it

3lastic said:
Thanks diemadedrei and ChrisJ951.
It worked, it was the Xperia Security software that was enabled.
Click to expand...
Click to collapse
Thanks to all, I have tried to change it to "YES" 24 hours

OK so with this recent tidbit of data that a bootloader unlock no could become a yes I am concerned. When I bought the phone it said yes. But no where can I figure out if the DRM keys are a)original b)intact c) working with this present rom. Could anyone tell me so I can be sure that if I resell this item I don't misrepresent this information.

haist i have a same problem for that issue ...until now i can not flash boot img...please resolve this problem...guys plssssss......

i have the same problem i cant flash img due to remoted lock state: unlocked

any updates?
I am suffering the same problems as my colleagues in the previous posts. I cannot get the bootloader unlock, no matter how hard I try:
performed the official Sony way (using minimal adb and fastboot; phone is listed in fastboot devices; "remote: command not allowed")
flashtool64: both with blu manually and by leaving the text file in the registered devices folder (which was found and used for a unlock, which turned out not to be successful).
Sony MyDevices is not activated. Android 5.0.2 (E6533; 28 0 A 8 272 HK)
Do you have any further tips how to open the bootloader?
thx, Benedikt

ChrisJ951 said:
Hey All,
I've seen some posts stating that the bootloader for this phone can't be unlocked.
I'm using the E6533 model and wanted to confirm that it is possible.
Just go to this website: http://developer.sonymobile.com/unlockbootloader/ (the official sony one)
Select Xperia Z3 as the model (I know we have the Z4/Z3+ but it still works). Enter your email and click the link they email you.
Insert the IMEI number and they will give you the unlock code. then just run
adb reboot bootloader
fastboot oem unlock <code>
and it will work.
As a note this WILL wipe your device, so backup anything you may need on it.
Hopefully with this we can get root / twrp built
Click to expand...
Click to collapse
Thanks for the tip but how I can back up TA Partition? Can you help me about that? And I am using latest Nougat Single Variant E6553, your tip will work with nougat?

I tried this Sony method but showing remote cammand not allow please help
---------- Post added at 05:50 PM ---------- Previous post was at 05:40 PM ----------
I trying same methods but showing remote command not allowed

hi
How long does it take to unlock ? the bootloader. I've waited for long.

Unlock bootloader NO
Any solution

i was crashing my head to do it and nothing to it done, and I discovered that the problem was that my xperia was enabled, so I disabled it and finally unlocked the bootloader

I had bootloader unlock allowed: no on latest firmware. I backed to Android 6 a I have bootloader unlock allowed: yes

Unlock/Lock Moto X Style Bootloader Multiple Times?

Hi Guys
I have 3 questions regarding Moto X Style Bootloader unlocking.
Can we unlock the Moto X Style bootloader after locking it after first unlock?
Can this process be repeated multiple times if we need to?
Can we use the same unique unlock key that we received while unlocking the bootloader for the first time?
Thank you

Why would you want to do this?

psandeepn said:
Hi Guys
I have 3 questions regarding Moto X Style Bootloader unlocking.
Can we unlock the Moto X Style bootloader after locking it after first unlock?
Can this process be repeated multiple times if we need to?
Can we use the same unique unlock key that we received while unlocking the bootloader for the first time?
Thank you
Click to expand...
Click to collapse
Yes you can do it as many times as you want but 1: Why would you relock afterwards 2: You will have to deal with a factory reset every time
PS: I dont know about the unlock key but most likely you can use the same

Is there any way to remove the Bootloader unlock warning ⚠ without relocking bootloader?
Sent from my XT1572 using Tapatalk

psandeepn said:
Hi Guys
I have 3 questions regarding Moto X Style Bootloader unlocking.
Can we unlock the Moto X Style bootloader after locking it after first unlock?
Can this process be repeated multiple times if we need to?
Can we use the same unique unlock key that we received while unlocking the bootloader for the first time?
Thank you
Click to expand...
Click to collapse
Theres no reason really to relock it. Once its unlocked, the bootloader will show that it was unlocked regardless if you relock it.
atishey23 said:
Is there any way to remove the Bootloader unlock warning without relocking bootloader?
Sent from my XT1572 using Tapatalk
Click to expand...
Click to collapse
Yes

Pyramid Head said:
Yes you can do it as many times as you want but 1: Why would you relock afterwards 2: You will have to deal with a factory reset every time
PS: I dont know about the unlock key but most likely you can use the same
Click to expand...
Click to collapse
Thanks for your reply.
The reason for attempting to re-lock bootloader is to get the OTA update from Motorola till date, especially Reliance Jio VoLTE support...But if I wish to make any further changes to my phone with any custom rom I should be able to do it by unlocking the bootloader again.
Thanks

psandeepn said:
Thanks for your reply.
The reason for attempting to re-lock bootloader is to get the OTA update from Motorola till date, especially Reliance Jio VoLTE support...But if I wish to make any further changes to my phone with any custom rom I should be able to do it by unlocking the bootloader again.
Thanks
Click to expand...
Click to collapse
You don't have to lock the bootloader to take an OTA. You just need to be in a completely unmodified stock state: stock recovery, unmodified system, no root, etc. Bootloader can be unlocked.

jason2678 said:
You don't have to lock the bootloader to take an OTA. You just need to be in a completely unmodified stock state: stock recovery, unmodified system, no root, etc. Bootloader can be unlocked.
Click to expand...
Click to collapse
Thanks for your reply.
I have unlocked bootloader, TWRP recovery and rooted. If I unroot and flash stock recovery, I will be able to get OTA? Do I need to take care of anything else?

psandeepn said:
Thanks for your reply.
I have unlocked bootloader, TWRP recovery and rooted. If I unroot and flash stock recovery, I will be able to get OTA? Do I need to take care of anything else?
Click to expand...
Click to collapse
That might work. Frankly I'm not sure. I haven't actually taken successfully an OTA on any phone since sometime in 2013 honestly.
I once flashed this phone totally back to stock. Every partition but logo, and it failed to take an OTA. I don't know if it failed because I had a modified logo, or maybe I had mounted system r/w. Not sure.
Hopefully someone more knowledgeable on this topic will chime in.

psandeepn said:
Thanks for your reply.
I have unlocked bootloader, TWRP recovery and rooted. If I unroot and flash stock recovery, I will be able to get OTA? Do I need to take care of anything else?
Click to expand...
Click to collapse
The answer is maybe... it depends what you have changed and what this OTA updater script actually checks for.
We know that a stock bootloader (which can be unlocked, that is not relevant), stock recovery, and stock system image are required to take an OTA. If the system image has been modified it can fail, and we know the updater has the ability to see if /system has EVER been mounted R/W and can fail for that condition although so far it doesn't seem Moto is going that extreme.
We do know a modified logo does not affect an OTA, in fact, you can even relock the bootloader with a modified logo so it must not be a significant check.

jason2678 said:
That might work. Frankly I'm not sure. I haven't actually taken successfully an OTA on any phone since sometime in 2013 honestly.
I once flashed this phone totally back to stock. Every partition but logo, and it failed to take an OTA. I don't know if it failed because I had a modified logo, or maybe I had mounted system r/w. Not sure.
Hopefully someone more knowledgeable on this topic will chime in.
Click to expand...
Click to collapse
On my father's moto e lte I received OTA without issue with unlocked bootloader, I just flashed stock image and it was ready to update, btw I'm not sure but I've seen somewhere info that you can change bootlogo even with locked bootloader so I don't think that's the issue.
Btw after you once unlock bootloader you won't be able to truly lock it again, next time you will be able to unlock it without any code so you lose some security in this process, frp won't be working anymore.

iks8 said:
On my father's moto e lte I received OTA without issue with unlocked bootloader, I just flashed stock image and it was ready to update, btw I'm not sure but I've seen somewhere info that you can change bootlogo even with locked bootloader so I don't think that's the issue.
Btw after you once unlock bootloader you won't be able to truly lock it again, next time you will be able to unlock it without any code so you lose some security in this process, frp won't be working anymore.
Click to expand...
Click to collapse
You still need code to unlock each time, but it's the same code, and if you relock OEM Unlocking gets turned off and you would have to turn it on again... So if something fails on the first boot after relocking, your f*cked, no way to unlock.
And FRP definitely works if the bootloader is unlocked, it is just much easier to bypass.

acejavelin said:
You still need code to unlock each time, but it's the same code, and if you relock OEM Unlocking gets turned off and you would have to turn it on again... So if something fails on the first boot after relocking, your f*cked, no way to unlock.
And FRP definitely works if the bootloader is unlocked, it is just much easier to bypass.
Click to expand...
Click to collapse
You're right sorry

How can I downgrade my XC from N to MM without unlocking the BL?

Hi, I want to backup my TA/DRM key. However the "Universal (Dirtycow-based) TA Backup v2" seems not compatible with Android Nougat. It asked me to downgrade my device first. Is there a way to downgrade Xperia X Compact without unlocking it (or without losing the DRM key)? Thanks.

yjcbn said:
Hi, I want to backup my TA/DRM key. However the "Universal (Dirtycow-based) TA Backup v2" seems not compatible with Android Nougat. It asked me to downgrade my device first. Is there a way to downgrade Xperia X Compact without unlocking it (or without losing the DRM key)? Thanks.
Click to expand...
Click to collapse
Just use the flashtool, you don't need to be unlocked to flash firmware.

XperienceD said:
Just use the flashtool, you don't need to be unlocked to flash firmware.
Click to expand...
Click to collapse
Thanks! Sucessfully downgrade to 6.0.1 and make a backup of the TA/DRM key just now.

XperienceD said:
Just use the flashtool, you don't need to be unlocked to flash firmware.
Click to expand...
Click to collapse
Another question. My phone is showing up "Bootloader unlock allowed: No" in the Service Menu. I've already turn on "OEM unlocking" and "USB debugging" (
authorized, and confirmed all the necessary drivers were installed).
The "Unlock your boot loader" site is saying that "It will only be possible to unlock the boot loader for certain releases." Does that means I should flash another firmware with differnt region or Android version? I've already tried to downgrade my phone to MM again, however the issue still exists. Thanks.
P.s. I am able to get the unlock code from the "Unlock your boot loader" site.

yjcbn said:
Another question. My phone is showing up "Bootloader unlock allowed: No" in the Service Menu. I've already turn on "OEM unlocking" and "USB debugging" (
authorized, and confirmed all the necessary drivers were installed).
The "Unlock your boot loader" site is saying that "It will only be possible to unlock the boot loader for certain releases." Does that means I should flash another firmware with differnt region or Android version? I've already tried to downgrade my phone to MM again, however the issue still exists. Thanks.
P.s. I am able to get the unlock code from the "Unlock your boot loader" site.
Click to expand...
Click to collapse
If your phone says that is is NOT allowed... sorry, but it is not possible.
Even though Sony is happy for us to unlock the bootloader, if the carrier/operator (verizon, o2, virgin, etc) wants - these companies can ask Sony to stop the bootloader from being unlocked.
Sim lock is one thing... at least that can be removed. I have no idea why they would choose to prevent the bootloader from being unlocked.
Actually, maybe because in some countries the consumer laws are very good, so even if you root or something, your warranty still exists.
But if you cannot unlock the bl -> you can't root -> less device problems/bricks -> less money on repairs for the phone operator? (just an idea)
The first (used) Xperia X Compact I bought, it was carrier branded, and the bootloader was unable to be unlocked.
I talked to the shop owner, I chose the other device in stock, it was unbranded, I could unlock it

qvmuhuuxz said:
If your phone says that is is NOT allowed... sorry, but it is not possible.
Even though Sony is happy for us to unlock the bootloader, if the carrier/operator (verizon, o2, virgin, etc) wants - these companies can ask Sony to stop the bootloader from being unlocked.
Sim lock is one thing... at least that can be removed. I have no idea why they would choose to prevent the bootloader from being unlocked.
Actually, maybe because in some countries the consumer laws are very good, so even if you root or something, your warranty still exists.
But if you cannot unlock the bl -> you can't root -> less device problems/bricks -> less money on repairs for the phone operator? (just an idea)
The first (used) Xperia X Compact I bought, it was carrier branded, and the bootloader was unable to be unlocked.
I talked to the shop owner, I chose the other device in stock, it was unbranded, I could unlock it
Click to expand...
Click to collapse
Thanks for your answer. Though it's a bad news for me. [emoji30]

Since it's impossible to unlock my device, can I just modify the FTF and flash it through the Flashtool? If it's possible, then how to modify the FTF file? I want to change the font into another.

yjcbn said:
Since it's impossible to unlock my device, can I just modify the FTF and flash it through the Flashtool?
Click to expand...
Click to collapse
No. If you've still got time to return it do so now otherwise your modding is going to be limited.

Relock bootloader

Hi, I need to send my p smart to huawei service due to battery problems.
My phone is rooted with bl unlocked and, it seems, my warranty is void.
If I remove root and relock my bl, my phone will be accepted regardless of the rooting?

Unfortunately no, because the bootloader status is RElock, not lock. Lock bootloader with DC Unlocker, because the program lock bootloader and change status to lock with 4 euro

Ok thanks, that actually seemed the only way.
If I use dc unlock to lock the bl, do you know if it makes my unlock code unusable for a future unlock and root? I mean, if I want to root my phone again, can I use the standard procedure (using my unlock code, twrp and so on) or do I have to use necessarily DC unlock?

Zioward said:
Ok thanks, that actually seemed the only way.
If I use dc unlock to lock the bl, do you know if it makes my unlock code unusable for a future unlock and root? I mean, if I want to root my phone again, can I use the standard procedure (using my unlock code, twrp and so on) or do I have to use necessarily DC unlock?
Click to expand...
Click to collapse
If you want unlock the bootloader again you can if you have a unlock code

Hey, did you Lock the bootloader again? If yes, could you give me a quick guide on how to do it? I unlocked mine some time ago and cant quite figure out how to lock it again now!

if have to dig this up. i can't relock my bootloader for some reason. is there an up to date method? flashed official through erovery. bootlocker and frp are unlocked atm.