Hp Officejet Pro 8620 Firmware Downgrade 〈Must Try〉

“The downgrade process was nerve-wracking, but the printer didn’t brick. My biggest mistake was not disabling auto-updates—two weeks later, it re-updated overnight. Second time, I blocked HP’s IPs on my router.” —

Yes, but with caveats.

Dynamic Security is HP’s term for a function that validates the electronic chips on ink cartridges. If the printer detects a chip that it does not recognize as an original HP chip, it will reject the cartridge. This results in error messages such as: hp officejet pro 8620 firmware downgrade