Watch the (orange light). It will begin to flash. Count the flashes carefully. Let it flash exactly 21 times .

: Locate the porous felt pads underneath the printhead assembly station.

Connect the printer to a Windows PC using a high-quality USB cable (Wi-Fi will not work in Service Mode).

Release both buttons simultaneously. The Power light will flash and then stay solidly lit, indicating Service Mode is active. Step 2: Use the Service Tool Software

This process is specific to the Canon G3400 and will clear all wireless configuration data.