Downgrading the HP OfficeJet Pro 8620 firmware is a common method used to bypass "Non-HP Chip Detected" or "Incompatible Cartridge" errors caused by HP's Dynamic Security. While HP officially states that downgrading is not possible, users often utilize third-party firmware files or specific "recovery" procedures to roll back to older versions like FDP1CN1416AR or 1910A. Critical Warning

Confirm Version: Check the printer's Support Menu (accessed by tapping the "Back" button 4 times) to verify the firmware has reverted.  Risks and Troubleshooting  Update the firmware on an HP printer | HP® Support

The Rewards:

• Use any third-party ink: Instantly save 70% on printing costs.
• Restore scanning/PC fax: Many users report that the new firmware breaks scan-to-email and network discovery. Downgrading fixes this.
• Regain control: You disable HP’s "phone home" feature for auto-updates.

If you see 20230309 (March 9, 2023) or higher, you are locked out. You need version 20220822 (1742A) or older.

No if:

Disclaimer: This article is for educational purposes. Downgrading firmware may violate HP's software license agreement. Proceed at your own risk.

Verify firmware version:
Setup → Printer Maintenance → Printer Status Report → Look for “Firmware Datecode”

The Risks and Rewards of Downgrading

Before we dive into the “how,” you need to understand the trade-off.