Look for an .exe file (e.g., HP_OfficeJet_Pro_8620_FDP1HA1416AR.exe or similar early version). Mac: Look for a .dmg file.
Power loss during flashing can permanently ruin your printer hardware. hp officejet pro 8620 firmware downgrade
A critical hardware risk exists when downgrading. If a user installed a third-party cartridge while on new firmware, the printer may have written data to the cartridge chip identifying it as "used in a locked printer." Downgrading the printer firmware might not unlock these cartridges, as the lock status is stored on the cartridge's own IC. The printer may continue to reject them, rendering the downgrade futile for that specific set of consumables. Look for an
: Do not power off the printer or disconnect the cable during this process, as it can permanently damage (brick) the device. Alternative: Restore Factory Defaults A critical hardware risk exists when downgrading