Don't want to upgrade epson xp231 in Chipless Firmware Solutions Posted November 18, 2019 · Report reply -It does not work. I tried several time. The new firmware from Epson ((FO04JA 04/10/2019) Cannot be erased. -When you say "normal working model", you mean no maintenance mode? I tried this too. Didn't work. -How can I be sure that all epson services and processes are disabled? Best regards.