HELP.. How to go from ics back to gingerbread

[RASH]

Hi guys hope someone can help..
I have been on ics for few months & loving it..
Few days ago I updated my brother-in-law sgs i9000 from Darkys rom xxjw1 > updated to Dark knight rom ics 4.0.4 ...

"he wants to go back to any gingerbread rom stock or custom"..!!

Firstly I made no backup & worst of all I cannot find anything Google search (no guides tutorials info) etc

CAN SOMEONE PLEASE HELP OR DIRECT ME..

[greenman]

Go to sammobile.com for your firmware and flash with Odin.
Remember to wipe data and cache before flashing.