: If the printer loses power or the connection is interrupted during the flash process, the printer motherboard can be permanently ruined (bricked).
Rolling your firmware back to a version compiled in 2019 or earlier removes the strict digital signature checks. This allows your printer to bypass the block and freely accept third-party ink. Pre-Downgrade Checklist
Once the utility states the process is successful, let the printer restart on its own. Method B: Using the HP Embedded Web Server (EWS)
HP does not officially support downgrading. Newer firmware (like FDP1CN2022AR ) is often locked to prevent reverting. hp officejet pro 8620 firmware downgrade new
Because the official HP Support Community explicitly blocks users from rolling back firmware through standard channels, managing this requires a manual workaround. This comprehensive guide provides step-by-step instructions to flash your printer back to a stable, cartridge-friendly version (like the 1910A or older 1900 series builds) and lock out future automatic updates. Why You Need a Firmware Downgrade
Starting around 2016, HP began embedding a feature called into firmware updates across its inkjet and laser printers. This feature is designed to block the use of cartridges that contain non-HP security chips—including refilled or remanufactured cartridges. According to HP, Dynamic Security "protects HP's innovation and intellectual property". For users who rely on more affordable third-party ink, however, the result is a sudden and unwelcome halt to printing.
HP® releases a new firmware update to remedy their recent ... - LD Products : If the printer loses power or the
If you do not turn these settings off, the printer will simply download and install the blocking firmware again within a few days. HP often tries to hide these settings, so follow these instructions carefully.
Obtain the older, working firmware file (e.g., a 2017 or 2018 version). Get Ncat: Download Ncat (a networking tool).
Put the printer in update-ready state
Attempting to downgrade the firmware on the HP OfficeJet Pro 8620 carries risks similar to updating a PC's BIOS. If the flashing process fails, or if the firmware file is corrupt or intended for a different region, the printer can become completely unresponsive (a "brick"). Once bricked, HP will likely deny warranty service due to the use of unofficial software. Additionally, note that this is not a one-time fix—you must constantly guard against accidental updates via HP Smart, network services, or driver installations.
Block third-party ink cartridges that were previously working. Force the use of more expensive genuine HP cartridges.
Wipe the electronic gold contacts on the third-party cartridges with a lint-free cloth and rubbing alcohol. Pre-Downgrade Checklist Once the utility states the process
Below is a comprehensive guide to understanding why your printer is rejecting non-HP cartridges and how to execute the latest manual firmware downgrade techniques. Why Is Your HP OfficeJet Pro 8620 Rejecting Ink?
