If you are extremely paranoid about HP sneaking an update through, assign the printer a static IP address and, in your router settings, block that IP from accessing the internet entirely. The printer will remain on your local network for printing but cannot reach HP's servers to download updates.
HP typically blocks downgrades via the printer's internal logic, which checks the version number before installation.
If you approach HP Support for a solution, the response is almost universally negative. A review of a support request from May 2025 shows an HP Agent bluntly stating, "After reviewing your case, I regret to inform you that downgrading the firmware on the HP OfficeJet Pro 8620 is not possible". Typically, the only advice from the manufacturer is to purchase genuine HP cartridges or to reset the printer, which does not roll back the firmware.
Therefore, before attempting any unofficial downgrade method, it is highly recommended to: hp officejet pro 8620 firmware downgrade new
You need a approach.
Beyond ink compatibility issues, firmware updates can also trigger other problems: some users report new region-locking behaviors that disable cartridges purchased outside the printer's intended region, while others encounter general stability or performance declines after an automatic update.
Turn on the printer, connect via USB, and run the downloaded firmware executable file ( .exe or .app ). If you are extremely paranoid about HP sneaking
All three now accept non-HP cartridges, and scanning/printing functions are fully restored.
HP OfficeJet Pro 8620 Firmware Downgrade New Guide The remains a highly dependable all-in-one inkjet printer, but aggressive firmware updates—such as the recent FDP1CN2022AR and newer 2025/2026 builds—frequently trigger the controversial "Dynamic Security" feature. This built-in restriction suddenly blocks compatible, third-party, or refilled HP 950/951 ink cartridges, rendering them useless and flashing errors like "Non-HP Chip Detected" or "Ink System Failure".
If the standard installer refuses to run because it detects a "newer version is already installed," you must force the printer into an upload state: Turn off the printer. If you approach HP Support for a solution,
Most experts agree: Downgrading your own hardware’s firmware for compatibility with safe, refilled cartridges is legal and reasonable under “right to repair” principles in the EU, UK, and several US states.
Unplugging or losing power during a flash can permanently damage the printer mainboard.