Downgrading your HP OfficeJet Pro 8620 firmware is the most effective way to restore printer functionality after an automatic update blocks third-party ink cartridges. HP frequently pushes firmware updates that activate "Dynamic Security," a feature designed to prevent the use of non-HP chipped cartridges. When this happens, your printer will display frustrating error messages like "Cartridge Problem" or "One or more cartridges appear to be damaged."

HP Officejet Pro 8620 Repair Help: Learn How to Fix It Yourself. - iFixit

HP removed all old firmware files from their official support site. You must find community archives.

HP does not officially host previous firmware versions on the HP Support site . You will need to find a trusted third-party source or use a backup.

By following this guide, you can regain control of your printing costs and continue using your HP OfficeJet Pro 8620 with the cartridges of your choice.

Unplug the power cord from the back of the printer while it is turned on. Wait 60 seconds, plug it directly into a wall outlet, and power it back up. If you want to make sure you have the right files, tell me: What operating system your computer runs (Windows or Mac)?

Because these updates can render perfectly good ink useless, the "firmware downgrade" has become a hot topic for users looking to reclaim their printer's flexibility. Why Downgrading is the "Hot" Fix