Hp Officejet Pro 8620 Firmware Downgrade [2021] Guide

: Do not power off the printer or disconnect the cable during this process, as it can permanently damage (brick) the device. Alternative: Restore Factory Defaults

For the OfficeJet Pro 8620, the firmware downgrade is a because it restores consumer choice. It turns a printer that refuses to print due to "cartridge error" back into a functional, cost-effective machine.