Reset Epson XP-640 to factory default

Recently I made the mistake of accepting a firmware update from Epson for my XP-640 and it really screwed up my printer which I was otherwise quite happy with. When the update was completed the display said that three of the five non-OEM cartridges were not recognized and would not allow me to proceed until I replaced them with Epson cartridges. Ironically it did recognize two remanufactured cartridges (one LD and another ValueToner) as certified Epson.

Is it possible to reset my...

Reset Epson XP-640 to factory default