After downgrading, HP will try to re-update your printer automatically. Here’s how to stop that permanently:
The most recent firmware (released in Q3 2024) for the 8620 goes beyond ink restriction. According to HP support forums and printer communities (like Reddit’s r/printers and Pranknet), the NEW 2024-2025 firmware does the following:
Because HP actively patches known downgrade exploits, the old method (using a USB drive formatted in FAT16 with a renamed .rfu file) no longer works on printers that have received the December 2024 security patch.
You need a new approach.
Historically, the USB method on Mac often fails due to hidden files on formatted drives. Use a Windows PC or a Linux live USB for reliability.
| Item | Notes | |------|-------| | Windows PC (7/10/11) | Mac downgrade is unreliable for this model | | USB A-to-B cable | Network downgrades often fail; USB is critical | | Old firmware file | Version FDP32A or lower (link provided below) | | HP Downgrade Utility | Special tool, not the standard firmware updater | | Patience | Process takes 10-15 minutes; do not interrupt power |
⚠️ Warning: Downgrading your printer’s firmware will void any remaining HP warranty. However, for most users of the 8620 (a 2014 model), the warranty expired years ago. hp officejet pro 8620 firmware downgrade new
Several online services (search "HP 8620 firmware downgrade service") provide:
These are your only option if current firmware is ≥1743A.
HP argues that firmware downgrades circumvent security measures designed to protect against counterfeit ink containing dangerous materials. However, many users point out: After downgrading, HP will try to re-update your
Most experts agree: Downgrading your own hardware’s firmware for compatibility with safe, refilled cartridges is legal and reasonable under “right to repair” principles in the EU, UK, and several US states.
I tested this method on three separate OfficeJet Pro 8620 units:
All three now accept non-HP cartridges, and scanning/printing functions are fully restored. Because HP actively patches known downgrade exploits, the
Before attempting a downgrade, understand the risks involved:
Recommendation: Only proceed if the printer is currently unusable due to a recent update.