The printer's display will show an update in progress; during this time. 3. Disable Automatic Updates Post-Downgrade
To downgrade the firmware on your HP OfficeJet Pro 8620 , typically to resolve "Non-HP Chip Detected" or "Older Generation Cartridge" errors, you must bypass HP's standard update tools. While HP officially states that downgrading is not possible, third-party methods often work. HP Support Community Step 1: Enable Downgrading on the Printer hp officejet pro 8620 firmware downgrade new