I should add that my upgrade attempt was in reaction to this error: https://www.support.xerox.com/en-us/article/en/2025084
and the reset to factory defaults which revealed this error was in attempt to fix my issue: https://forum.support.xerox.com/t5/Copying-Faxing-Scanning/Scanner-reported-an-error/m-p/243380
I have now purchased a brand new iMac and it doesnt work with this brand new Xerox C405 !
Being that this brand new printer has never really worked properly, I thought i'd check and see if there was any new firmware updates. I have previously upgraded to version: 68.66.11 via the bridge ver.
I downloaded 68.66.91 (676691_VL_C400_E) from:
https://www.support.xerox.com/en-us/product/versalink-c405/content/151394
Upgraded per instructions via the Internal Web Server but now I have error "MISSING FILE ERROR 016-742".
I am very disappointed that my brand new Xerox device is totally unsupported and has such unstable, fragle software and firmware and that there is no release testing !