How to set country (region) for WiFi globally in Linux Mint 20?

Question

Router: OpenWrt with CZ region successfully set for all WiFi adapters.
System: Linux Mint 20.1 Cinnamon, official link
WiFi driver: iwlwifi:
readlink /sys/class/net/wlp60s0/device/driver
../../../../bus/pci/drivers/iwlwifi

Problem:
iw reg get

shows BZ region, I remember to have set this region temporarily in my router, but not in computer(s).
What I tried:
sudo iw reg set CZ

That on one computer worked until reboot, on a second computer did not work at all.

Question
How to set country (region) for WiFi globally in Linux Mint 20.1 (Ubuntu 20.04 based) for the setting to apply across reboots?

LinuxSecurityFreak · Answer

I managed to find this file:
/etc/default/crda

which contains the following info:

Set REGDOMAIN to a ISO/IEC 3166-1 alpha2 country code so that iw(8) may set the initial regulatory domain setting for IEEE 802.11 devices which operate on this system. Governments assert the right to regulate usage of radio spectrum within their respective territories so make sure you select a ISO/IEC 3166-1 alpha2 country code suitable for your location or you may infringe on local legislature. See /usr/share/zoneinfo/zone.tab for a table of timezone descriptions containing ISO/IEC 3166-1 alpha2 country codes.

along with one setting only in my laptop, and blank (unset) on the second one:
REGDOMAIN=BZ

So the answer is to safely edit this file, e.g.:
sudoedit /etc/default/crda

editing the 2-letter country code, and I myself simply rebooted, but there may be other ways, which I did not explore like maybe restarting network.target or similar service.

How to set country (region) for WiFi globally in Linux Mint 20?

Problem:

What I tried:

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