Hp Officejet Pro: 8620 Firmware Downgrade

Downgrading the firmware on an HP OfficeJet Pro 8620 Go to product viewer dialog for this item.

If you want, I can:

  1. Use HP Genuine Cartridges – Expensive, but works.
  2. Replace the Mainboard – Find a used 8620 mainboard from a unit with old firmware. Swap it in (advanced repair).
  3. Buy a Non-HP Printer – Many users have abandoned HP for Epson EcoTank or Brother printers, which do not use dynamic security.

Step 2: Prepare Your Printer

  1. Turn off the printer using the power button.
  2. Disconnect the network cable (if using Ethernet) and disable Wi-Fi via the printer's front panel (Setup > Network > Wireless > Disable).
  3. Remove all ink cartridges from the printer. This prevents any cartridge check interference during downgrade.
  4. Connect the printer to your PC via USB cable.
  5. Turn the printer back on and wait for it to fully initialize (no blinking lights, ready status on screen).

This article will explain exactly why you might need to downgrade, the risks involved, and a step-by-step guide to revert your 8620 to a previous, functional firmware version. hp officejet pro 8620 firmware downgrade

Final Notes

A successful downgrade on the HP OfficeJet Pro 8620 can restore affordable printing, but the process is increasingly difficult on printers manufactured after 2018. Some units ship with bootloader-level protections that block any downgrade attempt. Always verify community reports for your specific hardware revision before proceeding. Downgrading the firmware on an HP OfficeJet Pro