While a successful downgrade restores the ability to use third-party ink, it introduces significant attack vectors. The HP 8620 is a sophisticated network node running a Linux-based kernel (HP’s Chai platform).
The HP Smart app on your phone or PC will try to re-enable auto-updates. Uninstall HP Smart and use the legacy instead.
If you have issues with your printer's connection or performance, you can also explore how to reset your network settings .
Press the four times consecutively (even if it is unlit). The hidden Support Menu will appear on the LCD screen. Use the navigation arrows to find Reset Menu and press OK. Select Semi-Full Reset or Full Reset and confirm. hp officejet pro 8620 firmware downgrade
Press and hold the button while also holding the Back (arrow) button. Release once the screen flashes or enters a "Support Menu." 3. Run the Older Firmware Installer Connect the printer to your computer via USB .
You need an older firmware version released before HP implemented the strict Dynamic Security blocks on this model.
Run the firmware downgrade executable file on your computer. While a successful downgrade restores the ability to
Downgrading the printer removes patches applied for these CVEs, turning the printer into a potential pivot point for attackers to access the wider network.
Turn on your HP OfficeJet Pro 8620 and wait for it to reach a quiet, idle state.
What is currently showing on your printer screen? Uninstall HP Smart and use the legacy instead
Downgrading firmware is inherently more complex than upgrading it. Manufacturers like HP typically design their systems to prevent "rolling back" to older versions to ensure security vulnerabilities aren't reintroduced. For the 8620, this often involves:
If you can source the older firmware version (such as version FDP1CN1416AR ), you can manually push it to the device. HP Support Community Source the File:
: Finding the specific, older executable (.exe) or firmware file that predates the dynamic security lockout.
For the OfficeJet Pro 8620, the firmware downgrade is a because it restores consumer choice. It turns a printer that refuses to print due to "cartridge error" back into a functional, cost-effective machine.
HP OfficeJet Pro 8620 Firmware Downgrade: The Ultimate Step-by-Step Guide