Hi! I own a XP-80, and I always had some MIDI timing issues, ocasional crashes, a bug that records midi messages in channel 16 when I'm using the sequencer (when recording in any of the other tracks), and another bug in the edit Menu, wich can only be solved by turning off and on again.
My question is:
Since I have old versions of the ROM/CPU, how do I update these? I been reading about this, and it seems that latest versions fix bugs with similar characteristics. Can someone explain me how is this done in detail? Any help would be appreciated. Thanks!

Ps: I don't wanna take my keyboard to the shop, I wanna do it myself, if possible. I bought it from another guy. Sorry about my English.