I had a phone (U8800-51) that was essentially bricked after I tried to restore a backup made with CWM. I had access to the pink screen and I could see the image partition when I booted to pink screen and connected to my PC. but restoring the backup image made with DiskImage_1_6_WinAll did me no good whatsoever and I could not get into recovery. The phone would turn on the ATT logo for a few seconds then shut off.
Soooo...I purchased a new phone (brand new for $27.00) and am now using it with stock 2.2.
But as a last resort, I removed the battery on the old phone, plugged it into my PC and tried to update using GB update.zip from the SD card. Imagine my surprise when it worked.....sort of. I now have a phone with GB 2.3.5 but no recovery or pink screen. No matter how I try it always boots to the OS. Also no mobile service. WIFI works great. So it is essentially a mini-tablet with no way to flash or customize it beyond this version.
Not a life changer since it is an extra phone. I may just use it as an MP3 player for my car. But it would be nice to be able to get it back to stock and working as a phone. It is a U8800-51.