Hp Officejet Pro 8620 Firmware Downgrade

You must put the printer into a manufacturing service state. Turn off the printer. Hold the power button down while plugging the power cord back in, tapping the "Back" arrow key (the bottom left touch icon) four times rapidly until a blue "Engineering Menu" or "Support Menu" appears. Navigate to the firmware update sub-menu to force the USB connection open. Printer Dropped Connection Midway

Print a configuration page: Check “Firmware Datecode” – should show the older version (e.g., 20170912 or 1829A ).

: If the downgrade succeeded but the error remains, take out the third-party cartridges, clean the gold chip contacts gently with a lint-free cloth, reinstall them, and restart the printer. If you'd like to proceed safely, let me know:

If your HP OfficeJet Pro 8620 has a bootloader version that rejects old firmware, you have limited options: hp officejet pro 8620 firmware downgrade

feature that blocks non-HP (third-party or refilled) ink cartridges

If the downgrade worked, your cartridges should now be recognized. If you still see "Incompatible Cartridge," the downgrade either failed, or your printer has a hardware revision that permanently blocks the old firmware.

Once the firmware update completes, the printer may restart automatically. You must put the printer into a manufacturing service state

Reconnect the power cord to the wall outlet (HP recommends a direct wall outlet). Reconnect the power cord to the printer and turn it on. 2. Download the Older Firmware

A window will open displaying a list of connected HP printers.

If you cannot downgrade (e.g., because your bootloader is too new), you have three options: Navigate to the firmware update sub-menu to force

Close all open printing queues and applications on your computer.

Add these domains to your router’s blacklist:

You own your hardware. While HP has the legal right to push security updates, you have the right to choose which software runs on your device. Proceed carefully, back up your data, and good luck.

Once completed, the printer will automatically reboot itself. Step 5: Verify the Firmware Version

Try restarting your computer and the printer, then try again.