I have a GA-H61M-USB3-B3 - just done the 10.12.5 update on it and lost network.
I've always used the AtherosL1c kext before, which lives in clover/kexts on the EFI, and then inject kexts selected in clover config.
This doesn't seem to be doing it now for 10.12.5.
I've tried leaving it in...