While holding power, press the button once, the Back button once, and the Home button twice (or the specific sequence for your panel layout: Home-Back-Home-Home).
Place the .ful file on a USB flash drive formatted to FAT32. Insert the USB stick into the front port of the printer.
The printer should detect the "upgrade" (actually a downgrade in this case) and prompt you to install it.
Here’s an interesting, real-world-style review about downgrading the firmware on an , based on common experiences from tech forums and user communities. hp officejet pro 8620 firmware downgrade
While HP officially discourages downgrading and often removes older versions from its site, the community has found several workarounds: disabling dynamic security - HP Support Community - 9352430
The practice of downgrading the HP OfficeJet Pro 8620 firmware represents a classic conflict between consumer rights (Right to Repair) and manufacturer intellectual property protection. While the downgrade process is technically feasible using signed legacy firmware binaries, it is a precarious solution.
Connect the printer to a PC via a USB cable ; it should be the only USB device connected. While holding power, press the button once, the
Disconnect any other USB devices from your computer to avoid confusion. Turn on your HP OfficeJet Pro 8620. Plug the USB cable into the printer and your computer.
Before downgrading, it is helpful to clear the printer's memory.
The HP OfficeJet Pro 8620's firmware downgrade path is a complex and risky endeavor. While a community-developed script and method exist, the procedure offers no guarantees and comes with significant risks, including the potential of permanently bricking your printer. HP's official stance is that downgrades are neither supported nor possible. The printer should detect the "upgrade" (actually a
If you leave your printer connected to the internet with default settings, it will automatically download the newest firmware again within days. You must turn this feature off. Via the Printer Control Panel Go to (the gear icon). Select Printer Maintenance . Scroll down and click Update the Printer . Select Printer Update Options . Choose Do Not Check or Never Update . Via the Embedded Web Server (EWS)
After it restarts, check the Printer Status Report to confirm the version has changed. Alternative Method: USB Drive (Flash Drive) If the .exe file doesn't work: Obtain the .ful firmware file.
You will need a specific .exe (Windows) or .dmg (Mac) file containing the older firmware version (e.g., Version FDP1CN1416AR). Step-by-Step Downgrade Guide 1. Disable HP Updates