: You must find a specific older version (e.g., version 1400 series or earlier) from a trusted third-party archive or community forum, as the Official HP Support Site typically only provides the most recent version.
Some newer firmware versions block standard downgrades. You may need to put the printer into a special state: Turn the printer off. hp officejet pro 8620 firmware downgrade new
Legal and warranty notes
To downgrade the firmware on your HP Officejet Pro 8620 , you generally need to manually install an older firmware file (such as version FDP1CN1416AR : You must find a specific older version (e