Because HP actively patches known downgrade exploits, the old method (using a USB drive formatted in FAT16 with a renamed .rfu file) on printers that have received the December 2024 security patch.
Downgrading the HP OfficeJet Pro 8620 is a high-risk procedure. HP has successfully implemented "Anti-Rollback" features on many 8620 units produced in recent years. If you cannot find the specific older firmware file or if the official utility blocks the install, you may be forced to keep the current firmware.
On the printer display, go to and confirm by selecting Yes . Managing Future Updates
This article is for educational purposes. Downgrading firmware may violate HP’s software license agreement. The author is not responsible for any damage to your printer or loss of functionality. hp officejet pro 8620 firmware downgrade new
Interrupting a firmware flash can permanently "brick" (disable) the printer. Prerequisite: You must find an older version (e.g., version or
This guide assumes you have obtained a firmware file for the OfficeJet Pro 8620 (Europe and Americas versions vary). It is critical to use a version that is signed by HP , otherwise the printer will reject it.
This is the most common community workaround. It involves tricking the HP firmware update tool into thinking the current date is in the past, thereby unlocking the ability to reinstall older firmware (provided you have the installer file saved). Because HP actively patches known downgrade exploits, the
On your printer's touchscreen, swipe down and tap the (gear) icon. Scroll down and select Printer Maintenance . Select Update the Printer .
: If the software fails, close the program, restart the printer, and try running the installer again. Ensure the print queue is completely empty before starting.
Elias stared. He had been using the same third-party ink brand for years. It was affordable, high-yield, and worked perfectly. He knew, with a sinking feeling in his gut, exactly what had happened. The "Enhanced Security" update was actually a digital gatekeeper—a "dynamic security" feature designed to brick any ink cartridge that didn't have an HP-branded microchip. If you cannot find the specific older firmware
Turn off the printer, remove the cartridges, wait 5 minutes, turn it back on, and reinstall the cartridges.
The printer will reboot and should now accept non-HP cartridges. How to Prevent Future Firmware Upgrades