Alternative ways to factory reset? My Android 2.3 system  my PMP3384 tablet somehow crashed so seriously that I cannot even do a factory hard reset, because I cannot get to settings, only the following message appears again and again:

"Prestigio Home (process com.prestigio.android.launcher) stopped unexpectedly."
Actually this comes first and then a lot of other things, like calendar I have to force closed.

When I finally get to my Home screen this repeats itself.

I cannot get to bootloader because I dont have got hardware volume buttons...

Edit1: Oh yeah, I used it as a mass storage device before this happened. And a few power cycles before also used app2sd.
According to the instructions in the device's manual there should be a "reset" button on the back.  The manual does't have any information on how to use it, but I'd try pushing the button while the device is on, or turning it on while having this button pressed.