How to do a factory reset from USB thumb drive?

Get a USB thumb drive

Format your USB thumb drive as: FAT32

Download the factory reset file from: http://repo.volumio.org/Primo/factory_reset

Copy the factory reset file to your thumb drive and make sure the file is named exactly “factory_reset”  (Do not rename this file after download.)

Power OFF the unit

Insert the thumb drive to one of the USB ports

Power ON the unit

IMPORTANT: During this phase the unit may restarts multiple times and the factory reset will take about five to ten minutes to complete