To downgrade your HP OfficeJet Pro 8620 firmware—often done to resolve "cartridge problem" or "non-HP chip detected" errors—you must first enable the printer to accept older versions and then manually send the firmware file from a computer.
This is the most straightforward approach if you can find the specific or installer for the older version. Find the Older Version hp officejet pro 8620 firmware downgrade new
Downgrading firmware can violate HP’s warranty, introduce security vulnerabilities, and may cause functional issues. HP actively blocks downgrades on many devices. This guide is for educational purposes. Proceed at your own risk. After reboot, go to Setup > Tools >
– it blocks older versions. Instead:
Since HP does not provide old firmware on its official site, you must find these files via community backups or third-party ink retailers like Ink Hub or YB Toner . If the firmware fixes security vulnerabilities you need
If it’s , you are a candidate for downgrade.