I met the same problem here with M1 mbp. Is this app created with Windows Forms?
If so, I'm afraid the mono approach is no longer available for macs. Mono doesn't support Windows.forms under x64 while newer macos dropped support for x32.
I've tried running it with wine but Xperifirm returns ERROR: Invalid customizations list received!
Is it possible to provide another method for downloading firmwares? Or build an aarch64 version for this app?