Locate a verified repository to download an older HP OfficeJet Pro 8620 firmware file (typically versions from 2014 to early 2016, such as version FDP1HA1416AR or similar archive builds). Ensure the file matches your exact model number.
Are you currently blocked by an or grayed-out button error? Share public link
When HP releases a new firmware version (e.g., from 1738A to 1743A or 1759A), it often:
Downgrading the firmware on an HP OfficeJet Pro 8620 a highly effective, though unofficial, solution for users who want to bypass HP's "Dynamic Security"
Plug both your computer and printer into a stable power source (ideally a UPS) to avoid power interruption.
However, HP does offer an alternative. For non-HP ink users, HP provides a specific firmware update that the dynamic security feature. This official solution allows the printer to accept third-party cartridges and is the safest and most reliable method to resolve compatibility issues. hp officejet pro 8620 firmware downgrade
I can provide targeted troubleshooting steps based on your current setup.
On the printer display, navigate to > Printer Maintenance > Update the Printer . Tap Printer Update Options . Select Do Not Check .
Swap your USB cable to a different port on your computer. Avoid using external USB hubs.
If you do not disable automatic updates immediately after a successful downgrade, your printer will connect to the internet and reinstall the offending HP firmware within a few days. Method 1: Via the Printer Screen
HP has removed most legacy firmware files from their official support sites. You will need to find community-saved copies. The most commonly sought downgrade versions for the OJ Pro 8620 are: Locate a verified repository to download an older
Step 3: Put the Printer into Manufacture/Service Mode (If Required)
Connect the printer to a PC via a USB cable ; it should be the only USB device connected.
This article provides a step-by-step guide to downgrading your firmware, explains the risks, and offers permanent solutions to prevent future forced updates.
HP printer firmware is typically delivered as a .rfu (Remote Firmware Update) file. Modern HP printers implement cryptographic signature verification; the printer will only accept firmware that has been signed by HP's private key. Consequently, users cannot modify the firmware code (e.g., to strip out the DRM) and re-flash it. Instead, "downgrading" relies on flashing an older, legitimate, signed version of the firmware released by HP.
– Wait at least 15 minutes. If it remains completely frozen, restart the computer, keep the USB connected, and run the firmware installer executable file again to overwrite the corrupted block. Share public link When HP releases a new
Downgrade tools are typically Windows-based.
Once your firmware is downgraded, you must immediately disable automatic updates. If left enabled, the printer will automatically download the newest blocking firmware over Wi-Fi. Via the Printer Control Panel
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.
Check your printer’s control panel (under Setup > Printer Maintenance > Device Information ) to see your current firmware version. You will need an older version, typically older than 2016/2017, when Dynamic Security was aggressively pushed.