wireless N disappeared after update

[peer]

os: Buster - KDE-Plasma
After updating this morning I noticed that my wireless N-network was no longer visible. So now I have to use the wireless G-network.
What should I do to get my N-network back?????

###After a reboot the wireless N-network is visible again

adapter info:
lspci:

Code: Select all

02:00.0 Network controller: Qualcomm Atheros AR93xx Wireless Network Adapter (rev 01)

driver info:
sudo ethtool -i wlp2s0

Code: Select all

driver: ath9k
version: 4.19.0-17-amd64
firmware-version: N/A
expansion-rom-version: 
bus-info: 0000:02:00.0
supports-statistics: yes
supports-test: no
supports-eeprom-access: no
supports-register-dump: no
supports-priv-flags: no

[arid]

###After a reboot the wireless N-network is visible again

You have learned a valuable lesson.

There is an old developers tale that you don't have to do a reboot when changes are made in linux.

I don't care what your problem is: Always try a reboot especially where deamons have to be restarted such as in your case.

Or you could spend the better part of a lifetime entering obtuse functions into that little black box, such as some posters on this forum would have you do, only to become dazed and confused and ready to use the other guys system.