By accident I upgraded firmware of my Epson WF-3720 to version CL1319. I was shocked my re-manufactured cartridges don't work any more. I found this site and wanted to buy a "KEY" to fix firmware.. however I can't get my printer into Maintenance mode. Do i need to have genuine Ink cartridges installed.? Currently I removed the re-mfg cartridges and have no cartridges installed. Thanks for info how to enter maintenance Mode so I can try this software solution.
P.S. I've tried the (Pressing Power Button and press Upper Right of Display screen at the same time). No luck.. it boots right to Cartridge ERROR screen.