Instructions are simple:
1. Make an imei backup using 5iromtoolbox.See Attachment.
2. Make a total backup using Roadkil's disk image(must be in pinkscreen to make backup). If there is an error, POST it.
2b. Follow this guide to flash old gingerbreadhttp://forum.xda-developers.com/show....php?t=1698308.
3. Wipe Battery Stats/cache/dalvik cache in cwm
4.Install it using unofficial cwm 126.96.36.199.
5. Reboot system and enjoy.
6. If there is a problem than revert it to stock 2.2 via disk image and start over again.
Download link: Dropbox
Cm7 can be flashed over it.
Original links: (In Spanish)