You will need to source an older firmware version (usually versions preceding 2016 or specific non-security versions like FDP1CN1416AR or similar).
Older firmware may be susceptible to security risks if your printer is connected to the internet.
Even with older firmware, HP has a feature called "Cartridge Protection" that locks ink chips to one specific printer. To prevent future headaches, go to the printer’s web interface (type its IP address into a browser), navigate to the tab, and disable HP Cartridge Protection . Troubleshooting Common Issues hp officejet pro 8620 firmware downgrade better
If you are struggling to find the right firmware version, let me know the specific error code you're getting and I can try to help you locate the right resources. HP Officejet Pro 8620 e-All-in-One Printer - HP® Store
Here is the trick most guides miss:
The most severe version of this problem was observed with version FDP1CN2022AR . A request for help sent to HP Support in May 2025 illustrates the nightmare: the user reported that after the update, the printer began rejecting genuine HP 950 and 951 cartridges that worked perfectly before the update. The printer would display errors when all four cartridges were installed, but would only work if three were inserted. This is not just about blocking cheap ink; it was breaking the core functionality of the device.
: If you have a stock of older generic cartridges, they may only work with the firmware version they were originally designed for. Risks to Consider You will need to source an older firmware
Downgrading your printer's firmware can be a complex process, and there's a risk of causing further problems. Additionally, HP may not always provide older firmware versions for download, making it difficult to obtain the specific version you need.
The downgrade movement is a direct manifestation of the philosophy. Owners argue that once they have purchased the hardware, they own it entirely—including the right to run whatever software (firmware) they choose. Downgrading is not piracy; it is a rollback to a previously functional state. In fact, several class-action lawsuits (e.g., In re: HP Printer Firmware Update Litigation , 2020) have alleged that HP’s forced updates constitute “bricking” and unfair business practices. While HP has settled some cases, paying small reimbursements to affected users, the fundamental firmware lock remains. To prevent future headaches, go to the printer’s
HP OfficeJet Pro 8620 Firmware Downgrade Better: Unlock Third-Party Ink and Reclaim Your Printer