You can flash these roms as often as you like - install one, return to the previous one, etc.
But, remember, use only the PDA mode to flash roms.
I8320BUJC1 (latest one, from March 2010)
http://www.mediafire.com/?tvyhf4efihu-modification
of java access permissions to apps (like opera mini or gmaps, framed
icons on the menu (runs applications that minimize when applying a
theme)
-modification of java access permissions to apps (like opera mini or gmaps.
Note: If you need to make a factory reset
make sure you install the official C1 before doing it.