For the technically proficient, a more direct approach exists. A script known as was designed specifically for this series of printers. The script is designed to directly upload "timebomb-less" or older firmware to the printer via the network. However, note that the original maintainer noted that the script itself does not provide the firmware file. Users were expected to source the specific file needed (e.g., ojpro_8620_1416A_04152014_1.ful.rfu ) for the script to work.
: Ensure there are no pending print jobs in your computer's print queue. CompAndSave Step 2: Download Older Firmware hp officejet pro 8620 firmware downgrade new
Downgrading firmware can violate HP’s warranty, introduce security vulnerabilities, and may cause functional issues. HP actively blocks downgrades on many devices. This guide is for educational purposes. Proceed at your own risk. For the technically proficient, a more direct approach
Before attempting any downgrade, check whether simply updating to HP's solves the problem—HP has released updates that remove Dynamic Security for the 8620 series. If that does not work, the methods outlined in this guide—using HP's firmware utility, HP Web Jetadmin, or USB flash drive—have been reported successful by other users. However, note that the original maintainer noted that
Fortunately, you can bypass this limitation by performing a to an older, less restrictive version. This long-form guide will walk you through exactly why this happens, how to locate older firmware, and the step-by-step methods to downgrade your printer safely.