Downgrading the firmware on an HP OfficeJet Pro 8620 Go to product viewer dialog for this item.
You can use up existing third-party stock that you already purchased instead of throwing it away. hp officejet pro 8620 firmware downgrade
Try a different USB port on your PC. Ensure you are using a direct port, not a USB hub. Downgrading the firmware on an HP OfficeJet Pro