I've upgraded my RP-91 several times. The most recent firmware is 259, and it finally fixed the one problem I had with this player. When playing MP3 files that were either high bit rates or VBR, they would stutter and not play correctly. Now they play perfectly. I am not sure what other things may have changed going from 250 to 259. There are threads at
www.avsforum.com about this player and the firmware. Several earlier firmware changes did fix real problems with it, but I think by 236 they were all fixed and changes since then have been minimal.
SMK