If you previously used a corrupted or wrong version of the service tool, the EEPROM may be bricked. The mainboard must be physically replaced. Important Safety Warning Regarding Physical Ink Pads

The most reliable and safe method is to use a commercial software tool like WIC Reset Utility . Tools like WIC Reset are specifically designed for this purpose, offer dedicated support for the Canon MP250, and are regularly updated by their developers. They are a small, one-time payment but provide a secure and guaranteed method of resetting your printer without the risks associated with unofficial service tools.

Later versions (v2000+) often remove support for older printers like the MP250. v1074 is the last known stable version that reliably communicates with the MP250’s legacy firmware.

Press and hold the button (the red triangle inside a circle).