I tried that. I used z4root to root it when it was 2.2 then i unrooted and updated to 2.2.1 and used gingerbreak so i could get 2.3.3
also when i get into Superuser i click Su binary v original (tap to check for updates) it says checking then there is a new version of su i click ok then it says an error occurred and the su was not updated. a zip file (su-2.3.1-bin-signed.zip) has been placed on your sdcard, please reboot into recovery mode and flash it to update your su binary