It is highly recommended to perform the downgrade via a USB cable rather than Wi-Fi to ensure a stable connection. How to Downgrade Your HP 8620 Firmware (General Steps)
If your printer was working fine yesterday and stopped today after an overnight update, a downgrade is the most direct fix for those sudden "Supply Problem" alerts. Things to Know Before You Start hp officejet pro 8620 firmware downgrade better
Why Downgrading Your HP OfficeJet Pro 8620 Firmware Might Be a Smarter Move It is highly recommended to perform the downgrade
You will need to source an older version (typically versions from 2014 or 2015 are the most "open"). These are often found on community forums or archival sites since HP doesn't host old versions on their official support page. These are often found on community forums or
If you prefer using more affordable, eco-friendly third-party inks, a recent firmware update can effectively turn your printer into a paperweight until you buy expensive, genuine HP supplies. Why Downgrading is Often "Better"
Once the downgrade is successful, the most important step is to go into the printer’s settings (on the touch screen) and Turn Off Auto-Updates . If you don't, the printer will simply download the restrictive firmware again within a few days. The Final Verdict