Yes, there are AR9220 based cards which are 5G only and it looks like you have one.
With the recent kmod upgrade (in testing), it is easy to make a system unbootable with a custom kernel. * Build a kernel using 'make tar-pkg'.* Copy it to the target machine.* cd / && tar xvfm <package>* Now /lib is overwritten and the system is borked.Using a rescue disc, the system can be recovered, but I just bricked a machine 500kms away.