Is performing a factory reset a viable solution for an E9 error, and what are the steps?

A factory reset can sometimes resolve an E9 error by reverting the printer to its default settings, which might clear corrupted data. The steps vary by model, but generally involve pressing a combination of buttons (e.g., power button + cancel button) while turning the printer on, or accessing a hidden service menu through the control panel. Consult your printer's manual or HP support site for specific instructions for your model as it erases all custom settings.