Sorry for my bad English
You need to follow these steps :
1- you need to apply the steps in the following thread ( http://forum.xda-developers.com/showthread.php?t=950324
) , to root and install xRecovery in your mobile , because most of 2.2 android work in Xrecovery .
2- Download 2.2 android zip file from any thread you choose (you need to made search for your favorite ROM , should be compatible with X10 MINI PRO ) and send it to the SD card in your mobile .
3- Go to Xrecovery menu by press back while you reboot your mobile .
4- choose wipe option and wipe your device .
5- then go back to menu and choose install zip from SD Card and select your ROM zip file
6- Reboot and enjoy
Pls note that rooting your mobile may void your warranty .
i hope that i could help you with this .