No. The unsigned .rfu file requires Windows’ raw USB stack. Macs add extra validation layers that HP exploits to block downgrades.
Downgrading the HP OfficeJet Pro 8620 firmware is a common method to bypass "Dynamic Security" locks that prevent the use of third-party ink cartridges. Because HP often removes older firmware from its official site, you will typically need to source the downgrade file from community archives or third-party providers. HP Support Community Step 1: Disable Automatic Updates hp officejet pro 8620 firmware downgrade new
Wait for the prompt to return and the printer to restart automatically. hp officejet pro 8620 firmware downgrade new