I'm sorry to hear that the img file wasn't any help. I don't know what else to say. When did you purchase your tablet? Maybe yours was a different batch that doesn't play so nice with other firmwares, that's all I can think of right now...
Well after a few frustrating hours of flashing and reflashing I still cant get it to boot. It either freezes, restarts or just stays on the "ANDROID" screen until I hard shut down. I even tried the factory reset button before flashing. So it looks like My tablet can only flash factory roms now. I'm trying to get the Eken rom to boot now and am having the same issue. Just to make sure the tablet still works I flashed the Gemei G9 V4.20.02 firmware and I can get that to boot. Just can't figure it out. Thanks for uploading the .img file so I could give it a try.