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First, you can't simply upgrade firmware of the AN1x as we are all used today with devices designed with this purpose in mind. You can only change the IC (memory chip) that is where the firmware is phisically located.
Or perhaps you can flash your old chip with a proper programmer and with the right file(assuming it's a eeprom, and not just a rom, if is this the case you simply can't as is, as the name stats, read only memory), but I never seen a single file containing firmware for the AN1x in the internets, so for me don't count on that.
Best bet finding a pre-flashed one off ebay or asking Yamaha customer support.
Seems that Yamaha lost changelogs (I read that on some forum around) and seems Yamaha don't know what differencies are between the 4 subversions (1 .01, .02, .03, .04)..this is a bit sad.
For 1.04 I've found this around:
"1.04 OS corrects an erroneous 'low voltage' warning which can occur prematurely and also corrects the audio response when modulating the depth, i.e., return, of delay effects."
I don't think is either recommended or necessary to upgrade as there are minor fixes, but this is IMHO.
My is 1.02 and will stay this way.
Some questions only...
What are the differences between the ROM versions ?How to check which version is installed ?Is it recommended or necessary to upgrade ?