root@OpenWrt:/# rmmod mac80211_hwsim
root@OpenWrt:/# rmmod mac80211
root@OpenWrt:/# rmmod cfg80211
root@OpenWrt:/# insmod cfg80211 ieee80211_regdom=US
module is already loaded - cfg80211
root@OpenWrt:/# rmmod cfg80211
root@OpenWrt:/# insmod cfg80211 ieee80211_regdom=US
root@OpenWrt:/# insmod mac80211
root@OpenWrt:/# insmod mac80211_hwsim
[ 1775.365383] mac80211_hwsim: initializing netlink
root@OpenWrt:/# iwinfo radio0 i
radio0    ESSID: unknown
          Access Point: 02:00:00:00:00:00
          Mode: Client  Channel: unknown (unknown)  HT Mode: NOHT
          Center Channel 1: unknown 2: unknown
          Tx-Power: 0 dBm  Link Quality: unknown/70
          Signal: unknown  Noise: unknown
          Bit Rate: unknown
          Encryption: unknown
          Type: nl80211  HW Mode(s): 802.11ac/ax/b/g/n
          Hardware: unknown [Generic MAC80211]
          TX power offset: unknown
          Frequency offset: unknown
          Supports VAPs: yes  PHY name: phy0
root@OpenWrt:/# ubus call iwinfo info '{ "device": "radio0" }'
Command failed: Not found
root@OpenWrt:/# service rpcd restart
root@OpenWrt:/# ubus call iwinfo info '{ "device": "radio0" }'
{
	"phy": "phy0",
	"bssid": "02:00:00:00:00:00",
	"country": "US",
	"mode": "Client",
	"txpower": 0,
	"quality_max": 70,
	"noise": 0,
	"htmodes": [
		"HT20",
		"HT40",
		"VHT20",
		"VHT40",
		"VHT80",
		"VHT80+80",
		"VHT160",
		"HE20",
		"HE40",
		"HE80",
		"HE80+80",
		"HE160"
	],
	"hwmodes": [
		"b",
		"g",
		"n",
		"ac",
		"ax"
	],
	"hwmodes_text": "ac/ax/b/g/n",
	"hwmode": "a/g",
	"htmode": "NOHT",
	"hardware": {
		"name": "Generic MAC80211"
	}
}
root@OpenWrt:/#