Official one http://blogs.sonyericsson.com/develo...2-smartphones/
I was thinking to myself if I were the CEO of SE the first thing that I would do is opening the bootloader and giving GB to x10.
Some companies started to put bootloader follwing the SE path. Now what they are going to do.
ANDROID IS READY TO (FREE)
Also, please note that you may void the warranty of your phone if you unlock the boot loader. See your phone’s warranty statement for details. Additionally, due to the modified phone software, Sony Ericsson’s repair network may not be able to properly test and repair your phone according to our normal procedures. Consequently, if Sony Ericsson does perform a warranty repair, Sony Ericsson may charge you a handling fee for any additional incurred costs due to your modification of the software.
Therefore, you should only unlock the boot loader of your phone if you are an advanced developer with good knowledge of the technology and risks involved. We strongly recommend that standard users NOT unlock the boot loader, as it is not needed. We are proud to deliver great phone experiences through our rigorously tested and official software releases.