For some reason, the A091 update does not work correctly. Anyone else have that problem? It terminates prematurely, and the drive does not work right. Panic! I thought it ruined my drive! I modded an A087 update that was in my Windows\Temp\ directory (includes the 0056.HEX that the A091 does not, and MCU v2.74 rather than v2.73). I replaced the A087.HEX with the A091.HEX, and updated the IDString.txt file to reflect A091. Worked like a charm, and didn’t have to do anything in DOS!
Hope this helps others!