Hello,
The PSR-800, Pro-18, Pro-668, and WS-1080 all have the same flash size, so no hardware changes are needed. I suspect the upgrade is replacing the bootloader in the scanner, so WS-1080 firmware can be loaded directly. There could also be firmware changes to handle the slight differences in hardware between the scanner models.
OK that makes more sense. Thanks for the clarification Eric. I found it hard to believe they would take a loss doing this by changing the CPU board. Now we just have to reverse engineer the bootloader from one of the modified 668's... just kidding of course...
Glad your Mom is doing well Eric.