5.2a doesn't come from Ketron you say, hehe?

Then whoever compiled it, did a better job than Ketron. It's on my keybord for almost 2 years, and it's running smoothly. Of course, it didn't fix the style writing bugs, neither.

I went all the way back from 4.2 to the latest OS from the official site... again, this evening. Nothing good come out of it... Waisted time.

Downgraded back to 5.2.a , the "non-existent Ketron FW", and I'm back in the game...

Why do you bother so much about where did 5.2a came from?