Wait at least 30 minutes. Firmware updates are slow. If it remains frozen for over an hour, unplug the power cord while the printer is on, wait 60 seconds, and plug it back in. This may force the printer into recovery mode.
To downgrade the firmware on your HP Officejet Pro 8620 , you generally need to manually install an older firmware file (such as version FDP1CN1416AR hp officejet pro 8620 firmware downgrade new
To successfully downgrade, you must first prepare the printer to accept an older file and then manually push that file to the machine. Wait at least 30 minutes
After successful downgrade, the printer will auto-update within 24 hours if connected to the internet. wait 60 seconds
Congratulations, you have successfully downgraded your HP OfficeJet Pro 8620 using the 2025 method.