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its a HTC DesireDepends on your original "firmware". Cant help without specifics.
oh cool and how can i reset the firmware back to original?Ok that's unbranded, so yes you can download the ruu for that and return competely to stock
OkayCompletely back to original, including unrooted: you download the RUU, plug your phone into the PC, and run the RUU. It does wipe the phone though.
Shipped-roms is the usually-referenced source of RUUs. The page I've linked there is for the GSM Desire.
Or if you want to return to your current ROM but stay rooted, take a recovery backup ("nandroid") before flashing - which you should do anyway - and if you don't like 2.3 just go back into recovery and restore from that backup. It will put your phone back to exactly the state it was in when you took the backup.
Read the FAQs in SUroot's sig before doing anything.
thank you very much!