Bootloader unlock allowed - Xperia Z4/Z3+ Q&A, Help & Troubleshooting

I have sony experia 402so with stock rom marsmallow,bootloader unlock allowed:yes.
And then,i was upgrade to nougat,bootloader unlock allowed: no.
Can anyone help me to changing again bootloader unlock allowed:no to yes?
Sorry my bad english.

deactivate sony protection and make factory rest and don't activate sony protection again
it will be yes again

I have sony experia z3+ 402so with stock rom marsmallow,bootloader unlock allowed:no. how to unlock bootloader ?Sorry my bad english.

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About warrenty??

hey guys i just want to ask one question!
i was recently using xperia zr but today i have buyed xperia z ........i have unlocked bootloader of xperia zr from official.
so my question is:
1) If i unlocked the bootloader of xperia z with TA backup ....and if i suffer from any issue ........i restore the TA backup and then i go to service center.......then will the recognize that i have unlocked the bootloader and will they void my warrenty?
2)Is they having a data of phone IMEI that this particular device has unlocked bootloader as we have unlock the bootloader from official site. and will they void warrenty till that date??
If this would be a problem with unlocking bootloader from official site ....plz help me to unlock bootloader unofficialy.!!!
niraj5.chaudhari said:
hey guys i just want to ask one question!
i was recently using xperia zr but today i have buyed xperia z ........i have unlocked bootloader of xperia zr from official.
so my question is:
1) If i unlocked the bootloader of xperia z with TA backup ....and if i suffer from any issue ........i restore the TA backup and then i go to service center.......then will the recognize that i have unlocked the bootloader and will they void my warrenty?
2)Is they having a data of phone IMEI that this particular device has unlocked bootloader as we have unlock the bootloader from official site. and will they void warrenty till that date??
If this would be a problem with unlocking bootloader from official site ....plz help me to unlock bootloader unofficialy.!!!
Click to expand...
Click to collapse
sony do not have the data of the phones unlocked unofficially. so if you brick your phone you can relock the bootloader with TA partition and DRM keys so that you can flash stock firmware using flashtool ( or repair using PCC ). Then you can visit service center

[Q] bootloader UNLOCK allowed:NO

need a helping hand
Please, can I use "kingoapp" Sony Bootloader Unlock on Xperia T, while it says: bootloader UNLOCK allowed:NO ?
http://www.kingoapp.com/sony-bootloader-unlock.htm
u can use towelroot to root locked bootloader device https://towelroot.com/

Problem unlock bootloader z3+

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.

Unlock Bootloader

Hello! So i bought my Sony Xperia SP and when i check the service menu Simlock: NO, Bootloader Unlock Allowed:NO.
I read here http://forum.xda-developers.com/xperia-u/general/tutorial-unlock-completely-xperia-t2534127 that when your phone is
simlock: Yes and bootloader: No you cant unlock the bootloader. Is there a solution to unlock my bootloader when its NO to both ?
acceleron said:
Hello! So i bought my Sony Xperia SP and when i check the service menu Simlock: NO, Bootloader Unlock Allowed:NO.
I read here http://forum.xda-developers.com/xperia-u/general/tutorial-unlock-completely-xperia-t2534127 that when your phone is
simlock: Yes and bootloader: No you cant unlock the bootloader. Is there a solution to unlock my bootloader when its NO to both ?
Click to expand...
Click to collapse
You cannot unlock the Bootloader if it says "Unlock Bootloader Allowed: No" in your service menu.
And trying any other methods to unlock it will probably brick your device. There are a lot of LB ROMs out there try out. Try them if you want.
Of course i want to change the rom, but for example cm12 has a lot of bugs and the other roms are for UBL. .

XPERIA Z - bootloader unlock allowed: no, but fastboot working.

I'm buying Xperia Z (SFR C6603) sim unlock or sim free i don't know.
Working with all sim cards.
I have problem: phone say bootloader unlock allowed: no,but fastboot & flashmode working.
Can i unlock bootloader or not? thanks. sorry for my bad english.
No you can't if it says no.
Fastboot works on all Sony phones, and on not unlockable roms it can be used to flash a pure stock kernel if you want. But you can also do that via recovery with the right update script or with ftf.

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