Here is the of using such a tool on Epson M Series printers. What the "Resetter Tool" Actually Does Epson printers have a service life counter for the absorbent ink pads inside. When full, the printer locks permanently with a "Service Required" error (flashing lights). An official reset requires a technician to replace the pads and run genuine service software.

It sounds like you are looking for a of the Epson Resetter Tool for M Series (specifically the ewora version or variant).

If you share your (e.g., Epson M1120), I can point you to a legitimate, tested reset method.