... iw reg set [2 letter country code, eg BE, DK, RU, AU, etc] works but does not survive reboot and it changes back to the original settings. ...
[Unit] Description=Change region to enable WIFI channels 12 & 13 [Service] Type=oneshot ExecStart=/bin/sh -c "echo OFF > iw reg set GB" [Install] WantedBy=multi-user.target
systemctl enable enablewifich.service