Hi guys,
Sorry I havn't been keeping an eye on this part of the forum for a while well here goes....
into a inverted flat spin...stall the model inverted then right rudder, left aileron, down elevator.
Right now to get it flat move the ailerons over to around center or even slightly right aileron....

NOW for the good bit add some throttle (just a few clicks...below 1/4...if i remember right) and play with the ailerons to keep the wings level, the descent should now stop and with some juggling should go back up.

Hope this helps,
I'll keep an eye out on this thread if you have any questions.

Cheers
Rich