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Please read this if you considering unlocking the boot loader or rooting your phone.
Please note that you may void the warranty of your phone and/or any warranty from your operator if you unlock the boot loader. You should only unlock the boot loader of your phone if you are an advanced user with good knowledge of the technology and risks involved.
For more information go here http://unlockbootloader.sonymobile.com/
Please also note
The Sony Xperia support team will not be able provide any support, related to unlocking the boot loader or rooting your phone.
We also recommend you to read the below blogposts.
Sony Xperia support team
2012-09-29 09:49 PM
Hi, I would like to know if pc companion can recognise phone with a locked bootloader. My xperia ray has an unlocked bootloader but pc companion is able to recognise it. I am also now not able to root my phone or relock the bootloader. The rooting process finishes but there is no superuser app. Also how do I flash Cyanogenmod , I get assert failed status 7 error. How can I fix this?
2012-09-30 07:11 AM
I can't remember PCC can recognize or not. But I know we can relock the bootloader. Bcoz I did it before. If the rooting wasn't success, try in different user account. I got a problem like you. Then I used separate UA & then it's ok. In Cyanogenmod pages in XDA have full guide for it. Everything is there.
Relock bootloader & try root. Most probably it'll work.
Then unlock BL again.
flash CM9/10.. .zip & gapps .zip
That's all I know..
2012-10-09 10:13 AM
PCC can recognize the Xperia device as it is even after unlok/relock bootloader. All the things working like before. But if you are trying to update your phone software or repair it, then the PCC will abort th installation and say " The phone has modified software " when unlocked. Then you cannot use SUS or PCC for any software update or repair. PCC can recognize and do all with locked bootloader. Unlock>> do any thing>>relock>>get updates>>unlock
And also for root, flash the 4.0.3 kernel and root, then again flash 4.0.4 kernel. It's the method. Nabeel described it somewhere..