Theoretically Armbian supports wifi on BPI M2+ since v5.13. I'm on v5.25 desktop version, bluetooth works but no wifi.
Do I need to install any drivers?

 

IIRC some M2+ board revisions had defective WiFi chip or chip which needed special attention. But before inventing the wheel again, please supply some logs with armbianmonitor -u

8 hours ago, vovolixo said:

Do I need to install any drivers?

No, you need a different firmware. The famous manufacturer of this M2+ fail exchanged Wi-Fi chip (AP6212 in the beginning, now AP6212A).

Strangely, I've got the WiFi working on M2+ once about 3 weeks ago (remember I've posted that they ship me sample without any antenna) , but since then it is not even able to scan APs. I think the AP6212 on my board simply become dead on radio side, although the wlan0 still appears with the latest firmware.

 

Here is the link for the output of armbianmonitor, @Igor.
http://sprunge.us/HDOj

You have new chip, while firmware does not exists yet in last stable firmware package. Next update should fix this, but one of current workaround is to manually copy those files: https://github.com/armbian/build/tree/master/bin/firmware-overlay/ap6212 to your /lib/firmware/ap6212 and reboot. Perhaps renaming nvram.txt to config.txt might be needed.

No luck, both renaming and not renaming nvram.
Guess I'll use a USB adapter until the next update.