If you want to flash a different RUU (requires Windows) you can skip the downgrade image (note: SLCD owners should be careful flashing other RUUs, it will likely break the screen).
My phone have SLCD scrren. If I downgrade to hboot 083 and got root using unrevoked, how I know whith pre-rooted custom ROM I can flash, without ger SLCD break? OK... answer two post above, thanks!