POD Express or POD Express Bass:
Start by powering POD Express off and disconnecting any USB cable. While
holding both the ON and TAP footswitches, power on the device:
• If using batteries, connect a 1/4" cable into the device's IN jack to
power on.
• If using a power adapter, connect the adapter to the DC IN to power on.
When powering on the device, you’ll see all the AMP encoder’s LEDs flash
white briefly three times indicating the factory reset was successful.