I have a GH2 that was hacked and running the 88 patch. While shooting the battery ran out and the camera shut down. When I put in the fresh battery, I could record no problem, but i could no longer do any playback. When I got home I returned the camera to the original firmware, but not matter what I do I cannot get the camera to go into playback mode. Every time I hit the playback button the screen goes black and I get the SLEEP CANCEL" message. When I try and change the settings in the playback menu, it won't let me and the menu mode closes and goes back to shooting mode. I've tried everything, card reformatting, shooting in different modes, and resetting all settings, but nothing seems to work.

Any suggestions?