I have a no brand player that's exactly like the Teclast c290, except that after flashing it with the most recent (5029) C290 firmware I cannot use the touch buttons anymore

. Also it thinks it's charging all the time.
When I shake it, I can see it scrolling through the available menu items, but that's it.
I tried all available c290 firmware versions, none work.
I also tried all kinds of firmware (nexxtech c204, pentagram vanquish R wave, acme v500x among others).
I wonder how much shorts my flash can take 8)
The main board says:
C291M-V3.0
20070029
On the touchpad pcb it says:
C290KEY-V4.0(EKT8.....(can't read the rest)
20070713
I was convinced the original firmware was on the support CD, however I was too lazy to check for sure...
Anyone know any other firmware to try? I do have access to some more of these players (company present

), any way to extract/copy the firmware?