Go to Settings > Privacy > Factory data reset . This will erase all data and return the phone to its original out-of-the-box state.
Unofficial builds for Sony Xperia devices - Page 4 - iodé community soni jerikson obnovit android
* Boot to recovery: with device powered off and the cable disconnected, hold Volume down & Power keys until the device vibrates. * Go to Settings > Privacy > Factory data reset
To get a newer version of Android, you would need to "flash" a custom ROM. soni jerikson obnovit android