This guide is for informational purposes only. Proceed at your own risk. The author assumes no liability for damaged hardware.
Run the downloaded software as an administrator. The tool will search for your printer, and the model name will appear in the title bar. Select your printer and click the button to start the update, which can take 10-15 minutes.
Given the risks, the recommended approach is to solve the root problem without a risky downgrade.
Downgrading the firmware on an HP OfficeJet Pro 8620 is primarily done to bypass "Dynamic Security" features that block third-party or refilled ink cartridges. While HP officially states that downgrades are not possible through standard support channels, users have developed workarounds using older firmware files and manual installation methods. HP Support Community Prerequisites USB Connection : The printer must be connected to your PC via a USB cable. Ready State hp officejet pro 8620 firmware downgrade
Many users discover their printer suddenly stops working with their preferred generic ink after an automatic update. While HP states these updates maintain quality and security, users often seek to downgrade to a version like to save money and restore cartridge flexibility. The "How": Steps to Reclaim Your Printer
Watch the printer’s display screen. You will see a progress bar indicating that the flash memory is being rewritten.
A significant number of OfficeJet Pro 8620 owners seek a firmware downgrade for very practical reasons. The single most common complaint relates to ink cartridges. After automatic firmware updates, users report that their printers show error messages such as “Incompatible supply” or “Non-HP chip detected,” even when using the . Some users have even reported that genuine HP 950/951 cartridges began failing after an update. This guide is for informational purposes only
Print a configuration page: Check “Firmware Datecode” – should show the older version (e.g., 20170912 or 1829A ).
However, you must be technically comfortable with USB connections, command prompts, and disabling network features. If you rely on HP Instant Ink or cloud printing, do downgrade.
The bad news is that downgrading the firmware on your HP OfficeJet Pro 8620 is officially by HP. Multiple HP support agents have stated that once your printer is updated to a newer firmware version, it's designed to prevent the installation of any older firmware packages. This means that even if you have a legitimate HP firmware file, the printer will likely reject it. Run the downloaded software as an administrator
Firmware flashing utilities are significantly more stable on Windows operating systems than on macOS. Step-by-Step Guide to Downgrading the Firmware
Do not attempt a firmware downgrade over Wi-Fi or Ethernet. A temporary network drop can ruin the process. Connect your printer directly to your computer using a USB A-to-B cable.