As announced earlier, we are now launching a web page where you can get instructions and a key to unlock the boot loader of certain series of Sony Ericsson 2011 Android™ Gingerbread phones.
With its new generation of 2011 Xperia™ smartphones (including Xperia™ arc, Xperia™ neo, Xperia™ pro and Xperia™ PLAY) Sony Ericsson is allowing advanced developers to unlock the boot loader in a secure and legal way. This service will be available for certain releases of those phones. The only way to determine if you can unlock the boot loader for your phone is to connect your phone to the Fastboot tool in the Android™ SDK. For more details, please read the previous blog post on this topic: Unlocking the boot loader in the new Xperia™ smartphones.
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.
Certain content on your phone may also be inaccessible due to the removal of DRM security keys and the secure user data partition while unlocking the boot loader.
If you still wish to unlock the boot loader of your phone, and if you are aware of the risks involved, and have a good level of knowledge of the technology, you can visit unlockbootloader.sonyericsson.com. There you will find detailed instructions on how to unlock the boot loader (if possible on your phone). Just click Start unlocking the boot loader to get started.
Senior Program Architect at Sony Ericsson
UPDATED: For any questions, Sony Ericsson will monitor this thread on Google groups. However, we cannot guarantee an answer for every question asked in this forum.