QUOTE(LuffyPSP @ Jul 23 2011, 05:53 PM)
i did on my first day i got my phone. about 5 days ago. yes, my sgs2 still new and i flashed stuff and know pretty much everything.
it wont give you any options, in the clockwork mod recovery there is the option. well if you dont have cwm, then no need to worry lor, just update without wipe, cuz thats how updates should be.
currently using official update for my aunt's samsung galaxy ace.

if no Gingerbread yet have to use ODIN to make hers 2.3.3

yes..i root using CF-root..so I have CWM installed..but still don't know how to use CWM ..i google nandroid backup and found the following..how to press ALT-B for backup?
Performing a NANDROID Backup
At this point you should backup your phone via NANDROID
1 Turn your phone off.
2 Hold Home, press Power button to boot into Recovery Mode
3 Press ALT+B to start the backup.
4 Once the backup has completed press Home + Back