It's really wired, I actually have three different pcbs, Round 1, Round 2 normal and bt.
When it (sometimes) works I have a few keys that mostly don't work (9ol, and del & \), sometimes they work too so I just can't figure out what's going on.
Most of the times it boots up and it locks up after a little while, when it's connected to Windows I get a message about unknown usb device connected.
It really drives me mad to day the least...