By default, the printer protects itself from software rollbacks. You must turn this safety feature off:
Let me save you two hours of Googling:
As of early 2026, many users have reported that the latest firmware versions (such as those released in late 2024 or 2025) have made it difficult to use more affordable compatible cartridges. Downgrading to an older version, like the stable build, can restore your ability to use third-party ink and bypass "non-genuine" cartridge blocks. Step-by-Step Downgrade Process
The HP Firmware Update utility will open. It should automatically detect your HP OfficeJet Pro 8620. If it does not, click the drop-down menu and manually select it. Initiate the Downgrade: Click the Update button. hp officejet pro 8620 firmware downgrade new
This process takes approximately 20 minutes. Do not rush.
: Temporarily disable your computer's firewall or antivirus software, as they can block the firmware installer from communicating with the USB port.
Use remanufactured or compatible cartridges at a fraction of the cost. By default, the printer protects itself from software
Look for an option that allows you to upload a file (often labeled as Update the Printer ). Browse your computer for the older firmware .ful file and select it.
The is a high-risk, "last-resort" procedure primarily used to bypass Dynamic Security , a feature in newer HP firmware that blocks third-party or remanufactured ink cartridges. The "New" Downgrade Landscape (2024–2026)
Interrupting a firmware flash can permanently "brick" (disable) the printer. Prerequisite: You must find an older version (e.g., version or Initiate the Downgrade: Click the Update button
A: This usually indicates the firmware on the printer is newer or configured differently (region-locked) than the file you are trying to flash. In most cases, the standard HP Updater cannot force this change; you would need an advanced method.
: The printer will reboot once finished. If prompted about "non-genuine" cartridges, select OK or Continue to bypass the warning. Alternative: Factory Reset