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Locked bootloader - what can be done?

I have come here for some expert advice.
Before purchasing a new contract phone from O2 UK (Telefonica), I checked if the bootloader on the phone was locked. They assured me it wasn't. I have got the phone up and running and entered the service menu :
Bootloader unlock allowed : No
I want to root this phone and flash a new rom. The existing one is covered in O2 bloatware and branding, even on startup. Is there anything I can without being able to unlock the bootloader? I have seen this method (http://forum.xda-developers.com/xperia-m2/help/qa-rooting-locked-bootloader-ota-method-t2999665) for rooting, but I want to change the ROM for a stock kitkat 4.4!?

You can use this:
http://forum.xda-developers.com/showthread.php?p=58099150
To root, but if they say it wasn't, why don't you return it back or let them unlock it.
Good Luck
Xperia M2 D2303 on K.K. 4.4.4

I have rooted my m2 today never done it before. I flashed the internal/journalist 4.3 ftf for 2303 top one in list on flashtool
Then rooted with towel root apk then updated over air to 4.4.2 then to 4.4.4 checked with root checker then download SuperSU but not updated then forced root with flashtool then updated SuperSU binarys fixed ro/RW permissions. Hey presto one rooted m2 on 4.4.4. Use firmware from flashtool can't go wrong.
Sent from my rooted b/l D2303 using XDA Free mobile app

Is downgrade possible?

Hi guys, just a couple noob questions:
I'm planning to update to Marshmallow but, if I don't like it can I go back to Lollipop?
This is because maybe I'll have bugs like most people here and also because I want to root it(when they find an exploit) and that can only be done while in Lollipop am I right?
Thank you for your help.

Yes you can go back to lollipop if you want by flashing lollipop firmware with flashtool.
There is root for MM.

Is there root?
But I have to unlock the bootloader right? I'll just wait until there's a way to root without doing that.

No that's not right if an exploit is found on marshmallow then there would not be need to go to lollipop unless the exploit was found on lollipop. Also marshmallow has far less bugs than lollipop. But as @gm007 said there is unlocked bootloader root and you can downgrade by flashing firmware with flashtool
Sent from my Xperia™ Z5 using Tapatalk

GeramanX said:
Is there root?
But I have to unlock the bootloader right? I'll just wait until there's a way to root without doing that.
Click to expand...
Click to collapse
In case if you didn't know, if you're waiting for root without unlock because of the loss of functions e.g x-reality etc., check this link:
http://forum.xda-developers.com/xperia-z5/development/sony-credentials-restore-unlocking-t3296383
(Sony credentials restore after unlocking the bootloader), It simulates the sony credentials to get the sony functions back.
If you are waiting for different reason, just ignore my post.

Fleet.tw said:
In case if you didn't know, if you're waiting for root without unlock because of the loss of functions e.g x-reality etc., check this link:
http://forum.xda-developers.com/xperia-z5/development/sony-credentials-restore-unlocking-t3296383
(Sony credentials restore after unlocking the bootloader), It simulates the sony credentials to get the sony functions back.
If you are waiting for different reason, just ignore my post.
Click to expand...
Click to collapse
Thank you for your help guys, I'll update to Marshmallow and just keep waiting, I'm familiar with waiting since the PSP and PS3 era.

Quick questions about flashing 32.2.A.0.305

I have not received the 32.2.A.0.305 update for my Z5 yet, so I went to XperiFirm to check which region my device's firmware is from. It turns out the firmware is CDA 1298-2996 (South Africa).
I live in Australia and wish to flash the Customized AU firmware with CDA 1298-7277. I want to do this so that my device will be updated and will be using the Australian firmware.
My bootloader is locked; is flashing possible without unlocking the bootloader?
Will flashing a different firmware potentially cause damage (my device is not network locked, and single sim E6653).
Will this affect my warranty / DRM keys?
Thank you in advance, I appreciate any help :angel:

You are safe to flash almost any E6653 Firmware onto your E6653
Obviously dont flash test firmwares or ones that May lock your sim
Sent from my E6653 using XDA-Developers mobile app

Envious_Data said:
You are safe to flash almost any E6653 Firmware onto your E6653
Obviously dont flash test firmwares or ones that May lock your sim
Sent from my E6653 using XDA-Developers mobile app
Click to expand...
Click to collapse
Thank you And the DRM keys should not be affected? I have read that unlocking the bootloader only affects the keys.

csfrank271 said:
Thank you And the DRM keys should not be affected? I have read that unlocking the bootloader only affects the keys.
Click to expand...
Click to collapse
Flashing a FTF shouldent touch DRM At all.

Envious_Data said:
Flashing a FTF shouldent touch DRM At all.
Click to expand...
Click to collapse
Thanks again, I appreciate the knowledge!

csfrank271 said:
I have not received the 32.2.A.0.305 update for my Z5 yet, so I went to XperiFirm to check which region my device's firmware is from. It turns out the firmware is CDA 1298-2996 (South Africa).
I live in Australia and wish to flash the Customized AU firmware with CDA 1298-7277. I want to do this so that my device will be updated and will be using the Australian firmware.
My bootloader is locked; is flashing possible without unlocking the bootloader?
Will flashing a different firmware potentially cause damage (my device is not network locked, and single sim E6653).
Will this affect my warranty / DRM keys?
Thank you in advance, I appreciate any help :angel:
Click to expand...
Click to collapse
you can flash and what ever with your device, DRM keys are safe!
when u ulock bootloader, the device WIPE user Data and sony partitions (TA (trimArea) partitions) and DRM keys and FIDO keys will be lost!
this $h!t is with sony only!!
i rooted my fone and having modified kernel having DRM stimulation installed. its working fine now.
- at any given day, to a thirsty user who wants to CONTROL his Xperia to the most. i would say, ignore drm keys and make a deal with devil to have root access
- however since Xperia Z5 (unlike latest xperia Xseries) came out on LP kernel. so u can FLASH LP kernel and root it with app like kingroot and extract your DRM keys to windows pc and back it up. now u can flash the LASTED Android back on you Xperiaz5 and unlock your boot loader to have root access.
check this
http://forum.xda-developers.com/z5-...ting-xperia-z5-z5p-variants-drm-keys-t3437902

YasuHamed said:
you can flash and what ever with your device, DRM keys are safe!
when u ulock bootloader, the device WIPE user Data and sony partitions (TA (trimArea) partitions) and DRM keys and FIDO keys will be lost!
this $h!t is with sony only!!
i rooted my fone and having modified kernel having DRM stimulation installed. its working fine now.
- at any given day, to a thirsty user who wants to CONTROL his Xperia to the most. i would say, ignore drm keys and make a deal with devil to have root access
- however since Xperia Z5 (unlike latest xperia Xseries) came out on LP kernel. so u can FLASH LP kernel and root it with app like kingroot and extract your DRM keys to windows pc and back it up. now u can flash the LASTED Android back on you Xperiaz5 and unlock your boot loader to have root access.
check this
http://forum.xda-developers.com/z5-...ting-xperia-z5-z5p-variants-drm-keys-t3437902
Click to expand...
Click to collapse
Thanks for the advice, I will look into it in the future when CyanogenMod improves and I need to unlock the bootloader to install it. My main incentive for this would be to greatly improve the camera, which we all know takes very washed-out photos.
I have just gone through the firmware flashing process. Thankfully there are many guides available and it all worked just fine, so I am using the current, correct firmware now
The worst part was just the waiting and suspense (feels like a lot could go wrong).
Thanks again Envious_Data and YasuHamed!

csfrank271 said:
Thanks for the advice, I will look into it in the future when CyanogenMod improves and I need to unlock the bootloader to install it. My main incentive for this would be to greatly improve the camera, which we all know takes very washed-out photos.
I have just gone through the firmware flashing process. Thankfully there are many guides available and it all worked just fine, so I am using the current, correct firmware now
The worst part was just the waiting and suspense (feels like a lot could go wrong).
Thanks again Envious_Data and YasuHamed!
Click to expand...
Click to collapse
i had flashed Cm13 on XperiaZ and inbuilt camera app of CM13 was worse than xperia! and if you think you z5 camera isn't working properly then God Help you when you won't have DRM keys in place! because the DRM keys actually enables feature of camera which wont be activated if DRM keys are lost
nothing will go wrong! be confident! sony devices are Hardcore stallions! once you nail them! they will be your pet!

(Urgent Help) I need to know if i will get OTA if i root my Xperia Z5.

Please i need to know, recently i bought an Xperia Z5 Premium, but i want to root it, will i still get OTA updates?
And if someone can tell me what is the most secure way to root it.
I will thankyou a lot of your help, thanks:highfive:

OcainD said:
Please i need to know, recently i bought an Xperia Z5 Premium, but i want to root it, will i still get OTA updates?
And if someone can tell me what is the most secure way to root it.
I will thankyou a lot of your help, thanks:highfive:
Click to expand...
Click to collapse
If you use systemless root, you should be able to take updates; you'll have to unlock the bootloader and flash a custom kernel. Take a look at either SuperSU or Magisk.

Why would you need OTA, just flash newest version with flashtool and that's it.
And the most easiest way to root, is to :
unlock bootloader, flash latest 32.2.A.5.11 firmware using flashtool, and then flash patched stock kernel( twrp included), and flash latest supersu using TWRP (it will be installed systemless). Cheers

You won't receive any OTAs once you unlock your bootloader.

furkandeger said:
You won't receive any OTAs once you unlock your bootloader.
Click to expand...
Click to collapse
BTW, I will use this toolkit: https://drfone.wondershare.com/android-root.html
(Yes my xperia is supported by the toolkit)
Does this will unlock my bootloader?i dont want to loose OTA and i will only uninstall some bloatware and hide the button bar

OcainD said:
BTW, I will use this toolkit: https://drfone.wondershare.com/android-root.html
(Yes my xperia is supported by the toolkit)
Does this will unlock my bootloader?i dont want to loose OTA and i will only uninstall some bloatware and hide the button bar
Click to expand...
Click to collapse
As far as I know, there is currently no way of rooting Xperia Z5 without unlocking the bootloader. If you decide to do so, don't forget to take TA backup before doing it.

furkandeger said:
As far as I know, there is currently no way of rooting Xperia Z5 without unlocking the bootloader. If you decide to do so, don't forget to take TA backup before doing it.
Click to expand...
Click to collapse
Thanks mate, anyway i will wait for Nougat update to root my device

I wonder what would happend if somebody try to unlock device which has unlockable BL status...does he brick the phone or something other...
Sony Z5 black

Nah, it just fails to unlock.

BACKUP DRM KEYS BEFORE UNLOCKING !!!!! Just in case anything goes wrong and you need to take your phone to service center (so you won't void your warrenty)

"Bootloader unlock allowed :no" Can i root and install custom ROM still?

Please give me some noob friendly guide if possible
My model number is E6653
Bulid no 32.4.A.1.54
Kernel 3.10.84-pref blah blah blah
android 7.1.1
I was going to do this
https://www.youtube.com/watch?v=fdhAPeTJK6Y
was doing this okay without unlocking bootloader?
I was wondering if i had done this what could have come?

nicholes said:
Please give me some noob friendly guide if possible
My model number is E6653
Bulid no 32.4.A.1.54
Kernel 3.10.84-pref blah blah blah
android 7.1.1
I was going to do this
https://www.youtube.com/watch?v=fdhAPeTJK6Y
was doing this okay without unlocking bootloader?
I was wondering if i had done this what could have come?
Click to expand...
Click to collapse
how did you find out that your BOOTLOADER unlock is NOT allowed?
anways if your device's bootload cannot be unlocked then you cannot do anything!
however there is only one solution! , DOWNGRADE YOUR DEVICE TO ANDROID 5.1.1 ( use flashtool > Xperifirm > 2015 device z5(samuri)--take firmware "service Exchange Unit" form list(thats android 5.1.1) on which z5 was actually left SONY FACTORY)
once your downloaded firmware, close xperifirm and FLASHTOOL automatically trigger making ftf file for you ,
flash this firmware and TRY ROOTING it with KINGROOT or KINGOROOT , as ANDROID5.x.x had xploits and kingroot and root it.
now you have z5 device ROOTED (LOCKED BOOTLOADER).
and if even KINGROOT have no strategy then I don't have any other options for you

YasuHamed said:
how did you find out that your BOOTLOADER unlock is NOT allowed?
Click to expand...
Click to collapse
Easy. Dial
Code:
*#*#7378423#*#*
-> Service Info -> Configuration -> check the field 'Rooting Status' -> Profit.

balrajs99 said:
Easy. Dial
Code:
*#*#7378423#*#*
-> Service Info -> Configuration -> check the field 'Rooting Status' -> Profit.
Click to expand...
Click to collapse
I did same

balrajs99 said:
Easy. Dial
Code:
*#*#7378423#*#*
-> Service Info -> Configuration -> check the field 'Rooting Status' -> Profit.
Click to expand...
Click to collapse
YasuHamed said:
how did you find out that your BOOTLOADER unlock is NOT allowed?
anways if your device's bootload cannot be unlocked then you cannot do anything!
however there is only one solution! , DOWNGRADE YOUR DEVICE TO ANDROID 5.1.1 ( use flashtool > Xperifirm > 2015 device z5(samuri)--take firmware "service Exchange Unit" form list(thats android 5.1.1) on which z5 was actually left SONY FACTORY)
once your downloaded firmware, close xperifirm and FLASHTOOL automatically trigger making ftf file for you ,
flash this firmware and TRY ROOTING it with KINGROOT or KINGOROOT , as ANDROID5.x.x had xploits and kingroot and root it.
now you have z5 device ROOTED (LOCKED BOOTLOADER).
and if even KINGROOT have no strategy then I don't have any other options for you
Click to expand...
Click to collapse
That means by downgrade firmware I can root my device, but no surety for that. And no custom rom also.
I bought a second hand device. Now I am planing to sell it
Thanks for the reply.

nicholes said:
That means by downgrade firmware I can root my device, but no surety for that. And no custom rom also.
I bought a second hand device. Now I am planing to sell it
Thanks for the reply.
Click to expand...
Click to collapse
all the best, if you wana stick to Xperia Line then I would suggest for you
XZs or XZP
make sure you check the boot unlock status on display pieces, XZs can be rooted after boot is unlocked where XZP , you must buy $20 utility and run it for every update.
BOTH DEVICES , DRMKEYS cannot be BACKED UP
for z5, til XZ, drm keys can backed up!

i have Z5 Docomo AU model SOV32, and i want to custom rom mine, but when i check the Bootloader Status is "No".
So i can't do custom rom it ??
or any tips or way?, to do unlock the bootloader so i can do custom rom.
thanks before, and sorry for my bad english.
any answer for this noob question , many thanks.

zapkhiell said:
i have Z5 Docomo AU model SOV32, and i want to custom rom mine, but when i check the Bootloader Status is "No".
So i can't do custom rom it ??
or any tips or way?, to do unlock the bootloader so i can do custom rom.
thanks before, and sorry for my bad english.
any answer for this noob question , many thanks.
Click to expand...
Click to collapse
No, you cannot install custom ROM on that device . next time when you buy xperia device check Bootloader Status before hand.
No tips, No way. (so said)

I tried this but can't root so far even with Kingroot or KingoRoot.

YasuHamed said:
how did you find out that your BOOTLOADER unlock is NOT allowed?
anways if your device's bootload cannot be unlocked then you cannot do anything!
however there is only one solution! , DOWNGRADE YOUR DEVICE TO ANDROID 5.1.1 ( use flashtool > Xperifirm > 2015 device z5(samuri)--take firmware "service Exchange Unit" form list(thats android 5.1.1) on which z5 was actually left SONY FACTORY)
once your downloaded firmware, close xperifirm and FLASHTOOL automatically trigger making ftf file for you ,
flash this firmware and TRY ROOTING it with KINGROOT or KINGOROOT , as ANDROID5.x.x had xploits and kingroot and root it.
now you have z5 device ROOTED (LOCKED BOOTLOADER).
and if even KINGROOT have no strategy then I don't have any other options for you
Click to expand...
Click to collapse
Xperifirm always give you an option of downloading the latest rom for your device. My device is Sony Z5 so therfore I can donwnload nougat 7.1.1 from experfirm. Now coming to the point as you said earlier about lollipop 5.1.1
How you can download an older version of rom from xperifirm. I never find the way how do you?