Some newer firmware versions block standard downgrades. You may need to put the printer into a special state: Turn the printer off.
Before attempting a downgrade, ensure you have the following ready:
Navigate to and ensure "Firmware Update" is enabled.
Keep perfectly good cartridges out of landfills.
The HP Officejet Pro 8620 is a powerhouse printer, but many users have found themselves locked out of using affordable third-party ink cartridges due to "Dynamic Security" features included in recent firmware updates. If your printer suddenly rejects non-HP cartridges with a "Supply Problem" or "Cartridge Error," a firmware downgrade is often the only solution.
You specifically need the HP Officejet Pro 8620 N911n firmware, usually version FDP1CN1416AR or earlier.
Some newer firmware versions block standard downgrades. You may need to put the printer into a special state: Turn the printer off.
Before attempting a downgrade, ensure you have the following ready:
Navigate to and ensure "Firmware Update" is enabled.
Keep perfectly good cartridges out of landfills.
The HP Officejet Pro 8620 is a powerhouse printer, but many users have found themselves locked out of using affordable third-party ink cartridges due to "Dynamic Security" features included in recent firmware updates. If your printer suddenly rejects non-HP cartridges with a "Supply Problem" or "Cartridge Error," a firmware downgrade is often the only solution.
You specifically need the HP Officejet Pro 8620 N911n firmware, usually version FDP1CN1416AR or earlier.