Changing TXPower? Impossible... :(

Hello my friends,

yesterday was experimenting some Evil Twin techniques and was in need to raise my txpower.

At first tried to switch my reg to BO without any success.

Then i found some tutorial here and around the web and changed my regulatory.

Now if i type "iw reg get" i get the right values (30) for everything (i changed it for 00, BO and my country).

The problem is that doesn't matter what region i set (BO or my country) my txpower still be at 20dBm

That's what i do:

*ifconfig wlan0 down

ifconfig wlan1 down

reg set BO

ifconfig wlan0 up

ifconfig wlan1 up

iwconfig wlan1 txpower 30*

I don't get any error but my iwconfig show my txpower at 20.

I tried even in this way:

*ifconfig wlan0 down

ifconfig wlan1 down

reg set BO

iwconfig wlan1 txpower 30

ifconfig wlan0 up

ifconfig wlan1 up*

But doesn't matter, still get always my txpower at 20

Tried with many different adapters but nothing change, i'm running kali 2017.1 totally updated

Someone can put me on the right track?

Thanks ;)