Archer C7 V2 + external USB rt3070 unable to autenticate

Hi everybody. I've read a lot of info around there. But this is my first post.

The thing is I'm trying to configure a long range connection using an external USB antenna connected to the router.
After some module fighting, the device can scan for wifi networks and allows me to select and connect. But looks like the usb port resets as soon as wpa-supplicant starts its job.

I've even tried to manually set a lower power (10dBm) and even change the USB port just to be sure it wasn't a power draw issue (I think that given that scenario, it should arise when scanning for available networks. But just to be sure).

Tried different builds, compiled latest trunk with no success. Running on Reboot 17.01.4 r3560-79f57e422d as i write.

Anyone faced this before? I'm feeling a bit over my head atm.

Some logs and command output:

**logread**

Wed Nov 29 02:52:16 2017 daemon.notice netifd: radio2 (19626): command failed: Not supported (-122)
Wed Nov 29 02:52:28 2017 daemon.notice netifd: radio2 (19911): command failed: Not supported (-122)
Wed Nov 29 02:52:28 2017 kern.info kernel: [11974.703708] ieee80211 phy5: rt2x00lib_request_firmware: Info - Loading firmware file 'rt2870.bin'
Wed Nov 29 02:52:28 2017 kern.info kernel: [11974.731044] ieee80211 phy5: rt2x00lib_request_firmware: Info - Firmware detected - version: 0.36
Wed Nov 29 02:52:29 2017 kern.info kernel: [11975.177322] IPv6: ADDRCONF(NETDEV_UP): wlan5: link is not ready
Wed Nov 29 02:52:29 2017 daemon.notice netifd: radio2 (19911): Successfully initialized wpa_supplicant
Wed Nov 29 02:52:30 2017 daemon.notice netifd: Interface 'wwan1' is enabled
Wed Nov 29 02:52:30 2017 kern.info kernel: [11976.071040] usb 2-1: USB disconnect, device number 5
Wed Nov 29 02:52:30 2017 daemon.notice netifd: Interface 'wwan1' is disabled
Wed Nov 29 02:52:31 2017 kern.info kernel: [11976.960681] usb 2-1: new high-speed USB device number 6 using ehci-platform
Wed Nov 29 02:52:31 2017 kern.info kernel: [11977.290653] usb 2-1: reset high-speed USB device number 6 using ehci-platform
Wed Nov 29 02:52:31 2017 kern.info kernel: [11977.471835] ieee80211 phy6: rt2x00_set_rt: Info - RT chipset 3070, rev 0201 detected
Wed Nov 29 02:52:31 2017 kern.info kernel: [11977.520213] ieee80211 phy6: rt2x00_set_rf: Info - RF chipset 0005 detected
Wed Nov 29 02:52:31 2017 kern.debug kernel: [11977.538739] ieee80211 phy6: Selected rate control algorithm 'minstrel_ht'
Wed Nov 29 02:54:56 2017 daemon.info odhcpd[862]: Using a RA lifetime of 0 seconds on br-lan

**dmesg**

[11781.937422] ieee80211 phy5: Selected rate control algorithm 'minstrel_ht'
[11974.703708] ieee80211 phy5: rt2x00lib_request_firmware: Info - Loading firmware file 'rt2870.bin'
[11974.731044] ieee80211 phy5: rt2x00lib_request_firmware: Info - Firmware detected - version: 0.36
[11975.177322] IPv6: ADDRCONF(NETDEV_UP): wlan5: link is not ready
[11976.071040] usb 2-1: USB disconnect, device number 5
[11976.960681] usb 2-1: new high-speed USB device number 6 using ehci-platform
[11977.290653] usb 2-1: reset high-speed USB device number 6 using ehci-platform
[11977.471835] ieee80211 phy6: rt2x00_set_rt: Info - RT chipset 3070, rev 0201 detected
[11977.520213] ieee80211 phy6: rt2x00_set_rf: Info - RF chipset 0005 detected
[11977.538739] ieee80211 phy6: Selected rate control algorithm 'minstrel_ht'

**lsusb**

Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 006: ID 148f:3070 Ralink Technology, Corp. RT2870/RT3070 Wireless Adapter
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

**lsmod | grep rt2**

cfg80211 223808 6 ath9k,ath9k_common,rt2x00lib,ath10k_core,ath,mac80211
compat 10192 7 ath9k,rt2800usb,ath9k_common,ath10k_pci,ath10k_core,mac80211,cfg80211
crc_ccitt 992 2 ppp_async,rt2800lib
mac80211 395168 5 ath9k,rt2800lib,rt2x00usb,rt2x00lib,ath10k_core
rt2800lib 91328 1 rt2800usb
rt2800usb 14480 0
rt2x00lib 31504 3 rt2800usb,rt2800lib,rt2x00usb
rt2x00usb 7392 1 rt2800usb
usbcore 115664 5 rt2800usb,rt2x00usb,ledtrig_usbport,ehci_platform,ehci_hcd

**/etc/config/wireless (Relevant data)**

config wifi-device 'radio2'
option type 'mac80211'
option path 'platform/ehci-platform.1/usb2/2-1/2-1:1.0'
option country 'US'
option hwmode '11g'
option channel '10'
option htmode 'HT20'
option txpower '20'

config wifi-iface
option network 'wwan1'
option ssid 'MYSSID'
option encryption 'psk'
option device 'radio2'
option mode 'sta'
option bssid 'MACADDR'
option key 'PASS'