all you can do is to try different version of the update tools and different RKW firmware files until it resets to the original boot program for your player, loading upo the M29 may have caused this problem now
can you get the original firmware back onto the partition at all
also there is a cleaner tool here
http://www.mp4nation.net/forum/viewtopic.php?f=6&t=7737
its for onda but its for rockchips really, give it a run and see and then try this method rather than load upo the m29 firmware
http://www.mp4nation.net/forum/viewt...hp?f=43&t=8488
mainly the bit about getting the hidden partition active and the drivers installed