The humming thing happens with mine too, I guess all of them do, I use a cellphone screen protector indeed.
I'm really tempted to order one of these. Only thing stopping me is the issues you described while charging.
Have you brought this issue up with developer?
I would like to ask, since the battery is a Nokia clone (whose model I don't remember now) could I use an original Nokia battery as a replacement eventually?
the K101 save problem has been solved and new firmware has been updated.
http://kteam.ys168.com/ K101_K_FW_2014-04-22(PID00620601).rar (save bug fixed)
For older firmware, when the power shut down in game and the green LED turn off, if you hold the power button for 2 ~ 3 seconds , there will not be a save problem(Some TF's speed is too low, it cause saving issues) .
I'm looking for a device to play Pokemon Red, Emerald, TCG and Megaman Battle Network. Either the GCW Zero or Revo K101.
Should I spend $70 for the Revo or double for the Zero?