This guide aims to provide a general approach to downgrading the firmware of an HP OfficeJet Pro 8620 printer. If you're unsure about any steps or encounter difficulties, consulting HP Support or a professional might be the best course of action.
: Newer firmware updates (like version FDP1CN2022AR ) often block compatible cartridges, showing errors like "Cartridge is missing or damaged" . hp officejet pro 8620 firmware downgrade better