Low tx power mt7610e

I'm testing Wavlink WL-WN570HA1 outdoor AP running 19.07.3, 5Ghz wi-fi is built on mt7610e.
The problem that the Tx Power cannot be set higher than 13 dBm regardless of the country code used.
Values higher than 13 dBm (19 mW) are not even available in Luci. Setting higher power manually using iw phy phy1 set txpower fixed {value} has no effect.

# iwinfo 
wlan1     ESSID: "OpenWrt"
          Access Point: 80:3F:5D:xx:xx:xx
          Mode: Master  Channel: 149 (5.745 GHz)
          Tx-Power: 13 dBm  Link Quality: unknown/70
          Signal: unknown  Noise: unknown
          Bit Rate: unknown
          Encryption: WPA2 PSK (CCMP)
          Type: nl80211  HW Mode(s): 802.11nac
          Hardware: 14C3:7650 14C3:7650 [MediaTek MT7610E]
          TX power offset: none
          Frequency offset: none
          Supports VAPs: yes  PHY name: phy1
# iw reg get
global
country PA: DFS-FCC
	(2400 - 2483 @ 40), (N/A, 36), (N/A)
	(5150 - 5250 @ 80), (N/A, 36), (N/A), AUTO-BW
	(5250 - 5350 @ 80), (N/A, 30), (N/A), AUTO-BW
	(5470 - 5725 @ 160), (N/A, 30), (N/A)
	(5725 - 5850 @ 80), (N/A, 36), (N/A)
	(57000 - 64000 @ 2160), (N/A, 43), (N/A)

Edit: found a similar issue on github created recently - https://github.com/openwrt/mt76/issues/401

I have a similar issue with the same adapter, I don't really know if its only related to tx power, in my case the radio only works with channel set in auto after first boot, after some time, or if i change channel from default channel to any other the radio fails to boot, and it can't be found anymore. Reverting back to offical firmware fix the problem. In case you do not have the rom which is hard to find you can get it here . I would like also to suggest the change in the opewrt page related to the Wavlink WL-WN570HA1 so that it clearly advise that 5ghz networks is practically not working.