Congratulations, you have successfully downgraded your HP OfficeJet Pro 8620 using the 2025 method.
HP's official stance on firmware downgrade is clear: . In numerous HP Community threads, HP employees state directly that "downgrading the firmware on the HP OfficeJet Pro 8620 is not possible". One HP support representative wrote: "After reviewing your case, I regret to inform you that downgrading the firmware on the HP OfficeJet Pro 8620 is not possible". hp officejet pro 8620 firmware downgrade new
: Connect via USB and run the downloaded file. It should detect your printer model automatically. Confirm the Version : After the printer restarts, use the Support Menu use the Support Menu