Hey guys, quite the thread!
So like many of you, I purchased a random tester off of ebay several years ago and noticed some limitations that might be rectified by better firmware. Going off of the clones folder, I believe I have a MK-328. I attempted to flash Karl-Heinz Kübbeler's firmware based off some instructions from a Russian blog, but sadly I don't speak Russian and might have messed up some fuse settings. In addition, I was unable to dump the original firmware prior to flashing as I believe the chip was set to not allow dumping. (I'm not super knowledgeable when it comes to this stuff). Anyway, I am attaching images showing the unit, the board, the original fuses and lock bit settings, and the output from avrdudess. As it stands, a single button press will turn the screen on and then eventually fade to black after about 10 seconds.
Any input would be appreciated
-John