to downgrade to earlier firmware go to ota firmware thread in development forum (i think) and download the one you like to flash
then flash ota like any other rom, they are complete roms anyway.
but to don't forget to backup your files first
Past Phones: Siemens C25 - Siemens Me45 - Nokia 3410 - Nokia 3510i - Siemens S65 - BenQ e71 - Nokia 5800 Express Music - Palm Pre - Motorola Atrix - Samsung S7220 - HTC One x+ 32GB (Vodafone D)
modding since Siemens Me45