HP implemented code in newer firmware versions to verify the authenticity of ink cartridges via a chip authentication process. While HP claims this protects users from potential malware injection via malicious cartridges and ensures print quality, the practical result is the rejection of cheaper, third-party or remanufactured cartridges. For businesses utilizing the 8620, this resulted in a sudden inability to use existing inventory, creating a financial incentive to revert to older firmware that lacked these checks.
HP does not officially provide older firmware files. You must source the correct .rfu or .ful file for your specific model (typically version 1910A or older) from reputable third-party archives. Officejet Pro 8620 Downgrade firmware blocked by hp ? hp officejet pro 8620 firmware downgrade
Check the . It should match the older version you just installed. Insert your third-party cartridges to test. Troubleshooting Common Issues Printer not found Swap USB ports or try a different USB cable. "Update Not Applicable" HP implemented code in newer firmware versions to
If downgrading fails, consider using HP’s own high-yield cartridges, a cartridge resetter, or replacing the printer with a non-HP model that respects user choice (e.g., Epson EcoTank or Brother). HP does not officially provide older firmware files