firmware is a common but complex workaround for users facing "Non-HP Chip Detected" errors. While HP generally discourages downgrading due to security risks, users often seek it to restore the functionality of third-party or refilled ink cartridges blocked by "Dynamic Security" updates. Why Downgrade is "Hot"
: Newer firmware might embed code that locks the printer to a specific cartridge region, which some users found impossible to revert even after a "successful" downgrade. Summary of Steps Recommended by Users hp officejet pro 8620 firmware downgrade hot