Found fix for on-board WiFi of H96Max TV Box Rockchip 3318, with Armbian OS:
Went to following post in Armbian CSC forum, and followed instructions:
https://forum.armbian.com/topic/26978-csc-armbian-for-rk3318rk3328-tv-box-boards/?do=findComment&comment=143890
DETAILS OF STEPS I PERFORMED:
(1) Downloaded file nvram_2734c.txt from above noted post
NOTE: Had to log-in to Armbian CSC forum to download above noted file.
(2) Issued following command to preserve original wifi config file by adding .ORIG at it’s name’s end
sudo mv /usr/lib/firmware/brcm/brcmfmac4334-sdio.rockchip,rk3318-box.txt /usr/lib/firmware/brcm/brcmfmac4334-sdio.rockchip,rk3318-box.txt.ORIG
(3) Created new blank wifi config file by command below:
sudo nano /usr/lib/firmware/brcm/brcmfmac4334-sdio.rockchip,rk3318-box.txt
(4) Pasted into the new blank file, the text copied from file nvram_2734c.txt (see step 1 above). Saved and closed file.
(5) Rebooted
(6) Ran Command sudo nmtui (or sudo armbian-config) and configured & activated on-board WiFi