For MG2550s, this often clears errors and returns to out-of-box state:
I’ve seen a lot of questions lately about resetting the Canon MG2550S. Unlike higher-end models, the MG2550S doesn't have a "Restore Factory Settings" option buried in a maintenance menu because it doesn't have a display screen. canon mg2550s reset
While still holding , press and hold the Power button. For MG2550s, this often clears errors and returns
While still holding Power, press the Stop/Reset button 5 times in quick succession. Release the Power button. canon mg2550s reset