Hp Officejet — Pro 8620 Firmware Downgrade Repack

Try restarting your computer and the printer, then try again.

Open the downloaded older firmware executable file (e.g., as an Administrator on Windows). The HP Firmware Update Utility window will open.

Firmware versions released before late 2016 generally do not contain the strict dynamic security lockouts. Version FDP1CN1416AR is highly sought after for this specific model. hp officejet pro 8620 firmware downgrade

In 2016, HP released a firmware update for the OfficeJet 86xx series that specifically targeted and disabled many third-party cartridges. More recently, in early 2026, another update reportedly started affecting models including the OfficeJet Pro 7720—showing that HP continues to use this approach.

The firmware file must match your exact model number (not 8610, 8630, or 8640). The filename is typically something like OJ8620_1738A.exe or HP_OJ8620_FW_Update_1738A.exe . Try restarting your computer and the printer, then try again

Some newer HP firmware versions block changes. You may need to access the printer's hidden Service Menu to allow updates:

With the printer on, from the rear of the printer. Unplug the power cord from the wall outlet. Wait at least 60 seconds. Firmware versions released before late 2016 generally do

Reduce printing expenses by up to 70% compared to OEM HP cartridges.

⚠️ : The following guide is based on older, community-sourced information (circa 2016) for the HP OfficeJet 86xx series. Its success on newer firmware versions or different OS setups is not guaranteed . Due to the high risk of failure, it's highly recommended that you thoroughly research current forum discussions (e.g., HP Support Community, r/printers on Reddit) before attempting anything.

Ensure you are using a USB 2.0 port instead of a USB 3.0 (blue) port, as older flashing software struggles with newer USB protocols. If you need help finding specific resources, let me know: What operating system (Windows or Mac) are you using? What is your current firmware version code ? Are you currently getting an ink cartridge error message ?