On the printer control panel, swipe down the dashboard and tap the icon. Scroll down and select Printer Maintenance . Tap Update the Printer . Select Printer Update Options . Tap Do Not Check .
Ensure the basic HP OfficeJet Pro 8620 drivers are installed on your PC.
| Error Message | Cause | Solution | | :--- | :--- | :--- | | "Firmware downgrade not allowed" | HP locked the bootloader in newer versions | Force Recovery Mode (Step 3 above) or try an older intermediate firmware first (e.g., FDP1CN2083AR) | | "CRC Check Failed" | Corrupted firmware file | Re-download the file from a different source | | "Communication Timeout" | USB cable issue or printer sleep mode | Disable sleep mode. Use a shorter USB cable. Restart both devices | | Printer is stuck at 0% | Power-saving feature interrupted | Hard reset: unplug printer for 60 seconds, restart PC, try again | hp officejet pro 8620 firmware downgrade
You may need to use a Windows 7 or Windows 10 PC, as newer security frameworks in Windows 11 sometimes block low-level firmware manipulation tools.
Open the downloaded older firmware installer on your computer. The HP Firmware Update utility window will open. On the printer control panel, swipe down the
Connect your printer directly to a reliable wall outlet. A power loss mid-update can permanently corrupt the printer's motherboard.
To downgrade the firmware on your HP OfficeJet Pro 8620 printer: Select Printer Update Options
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.