The Cyberstorm flash updates are available here:
http://phase5.a1k.org/the code is available,its in the flash file.
There is a good thread over here you might also check:
http://eab.abime.net/showthread.php?t=70960It is possible to replace or reprogram the onboard flash chip,but you might exhaust all possibilities first.
There is a chip clip that can clip on the rom on the MKII and then go to your eprom programmer to program it "In Circuit", i have tried this with things like acard 7720U and such but not on an accelerator.
good luck and keep us posted.