Before you downgrade, you must stop the printer from automatically re-updating itself.
On the printer control panel, go to and set it to Manual or Off . Download Older Firmware Visit the HP Support website and enter your model.
While a successful downgrade restores the ability to use third-party ink, it introduces significant attack vectors. The HP 8620 is a sophisticated network node running a Linux-based kernel (HP’s Chai platform). hp officejet pro 8620 firmware downgrade
Why does HP block downgrades? The company cites “Dynamic Security” measures — a firmware-level authentication system designed to detect and block non-HP ink cartridges. While HP maintains that this protects their intellectual property and ensures print quality, many users argue it limits choice and forces them to purchase more expensive OEM cartridges.
If you want, I can:
What (e.g., Windows 10, Windows 11) is your PC running?
You will need to locate an earlier firmware version, such as version (or earlier, depending on what works for your cartridge supplier). Before you downgrade, you must stop the printer
When prompted with a confirmation asking if you want to turn off automatic updates, select or Disable . Method B: Disable via the Embedded Web Server (EWS)
Connect your OfficeJet Pro 8620 to a computer with a USB cable. HP strongly recommends avoiding a Wi-Fi connection during any firmware update to prevent interruptions. Ensure the computer and printer remain powered on and do not enter sleep mode until the process is fully complete. While a successful downgrade restores the ability to