Problems with Setting Up Txpower

i have completed all the steps with no problems but i cant set txpower higher than 20 dbm....

https://null-byte.wonderhowto.com/how-to/ultimate-guide-upping-tx-power-kali-linux-2-0-0168325/

I use the ALFA AWUS036NHA with the German: GE-AR9271 Chipset

here are my outputs:

uZer@Qu4ntum:~$ sudo ifconfig wlan0 down

uZer@Qu4ntum:~$ sudo iw reg set BO

uZer@Qu4ntum:~$ sudo iwconfig wlan0 txpower 30

uZer@Qu4ntum:~$ sudo ifconfig wlan0 up

uZer@Qu4ntum:~$ sudo iwconfig

eth0 no wireless extensions.

wlan0 IEEE 802.11bgn ESSID:off/any

Mode:Managed Access Point: Not-Associated Tx-Power=20 dBm

Retry short limit:7 RTS thr:off Fragment thr:off

Encryption key:off

Power Management:off

lo no wireless extensions.

and the output of db.txt for Germany (BO was set to 33 dbm too)

# Data from "Frequenznutzungsplan" (as published in April 2008), downloaded from

#

# For the 5GHz range also see

# http://www.bundesnetzagentur.de/cae/servlet/contentblob/38216/publicationFile/6579/WLAN5GHzVfg7_2010_28042010pdf.pdf

# The values have been reduced by a factor of 2 (3db) for non TPC devices

# (in other words: devices with TPC can use twice the tx power of this table).

# Note that the docs do not require TPC for 5150--5250; the reduction to

# 100mW thus is not strictly required -- however the conservative 100mW

# limit is used here as the non-interference with radar and satellite

# apps relies on the attenuation by the building walls only in the

# absence of DFS; the neighbour countries have 100mW limit here as well.

country DE: DFS-ETSI

# entries 279004 and 280006

(2400 - 2483.5 @ 40), (1000 mW)< changed from 100 to 1000 dbm

# entry 303005

(5150 - 5250 @ 80), (1000 mW), NO-OUTDOOR, AUTO-BW

# entries 304002 and 305002

(5250 - 5350 @ 80), (1000 mW), NO-OUTDOOR, DFS, AUTO-BW

# entries 308002, 309001 and 310003

(5470 - 5725 @ 160), (500 mW), DFS

# 60 GHz band channels 1-4, ref: Etsi En 302 567

(57000 - 66000 @ 2160), (40)

i have no idea what i have to do hope anyone could help me

thanks so much !