Unfortunately we Apple Silicon Mac owners can’t use boot camp to create a windows partition. I gifted my intel IMac to my mother. If need, I guess I can create a windows partition to update the firmware if really necessary.
I have been unable to use CHIRP via the USB C port since my M1 iMac doesn’t have a USB A port. The third party C to A hub I have is not working. I’m going to buy an Apple adapter and see if that works. In the meantime, I used the web based ODmaster to program the H3 via Bluetooth. The iPhone app is a PIA to use.