guide about how to go back to official gingerbread from cyanogenmod7 thought it might be useful to some of ya
Downgrading Galaxy ACE from CM7 to Gingerbread
Follow rules properly.
First download flash files here
. password - ekache99
Now start your galaxy ace in downloading mode
First switch off your galaxy ace and press together (power + home + volume
down) keys and wow your galaxy ace is in downloading mode. Remove your SD
card. Now open downloaded archive and there will be a application "Odin Multi
Downloader v4.38.exe" open it, connect your Galaxy ace in downloading mode.
Odin will show com port after you connect your Ace.
After that can you see a option OPS in odin ya that one click it
and locate "Cooper_v1.0.ops" in flash files.
Click on BOOT and locate
Click Phone and locate
Click PDA and locate
Click CSC and locate
No need to do anything with EFS leave it blank.
Till your phone is flashed take a 5 minute nap.
And when you wake up you will see your phone is started with
Now you can Install Official Gingerbread on This ROM or anything like FirstUA or Anyting can be Installed on this ROM.
all reps go to Galaxy Ace
for this information