Hey Al_a_man! I used to have an XP50. I had it until I obviously jumped up to an XP60. I was one day reading someone's XP/JV FAQ and they stated that early XP50s (Up to Serial# 25000) had Flash ROM because the early OSs were bug contaminated.

Hence the reason that if you go to the Downlads area on the Roland Japan or Denmark websites, you'll see upgrade files stored as MIDI files so you can play it through your sequencer so it would upgrade the OS.

Yes I did try this on my XP50 about a year ago. All it did was fix bugs, no new features or anything. The upgrades should still be there at those websites. If you want me to send it to you personally via e-mail, I'll look to see if I have them and then give it to you.

The Infamous EPU.