I already got some confirmation that if you modified the firmware or using any modded firmware, you will not be able to update to 2.3. The updater will give you a message that your firmware is not genuine. Like I said, to update, just switch back to SE's stock firmware and do not root it. Root AFTER you update to 2.3. XDA原帖 能不能 root 還有希望
Sony Ericsson All generic trade kits (and some customizations) of Xperia X10 is getting a 2.3 update. The roll out will start within a week but it might be a bit different for all the markets.