How to Install Gingerbread on Xperia X10

Now Available software scripts for the Gingerbread upgrade for Xperia X10. With this software, you can upgrade your SE Xperia to Gingerbread 2.3.3.

Step By Step :

Step 1: Backup all your data as all of the data will be wiped out during the installation process, that include contacts, messages and any user data saved on phone memory. Data on SD card will not be affected.
Step 2: To restore the data, you will need a third party app like MyBackup as the Backup and Restore app will be overwritten and it won’t be possible to restore data using that app.
Step 3: To install the update, head over to Sony Ericsson website and download PC Companion.
Step 4: Once PC Companion is installed, connect the USB cable to the PC and then to the phone.
Step 5: Now, on your phone, mount the SD card (drag the phone status bar down to do it)
Step 6: Tap on USB Connected > Mount. This will connect the phone and PC Companion will launch.
Step 7: Now follow the instructions on PC Companion to download and install Gingerbread for Xperia X10.

You can upgrade via Sony Ericsson