Hi normanT,
I have an Ugoos Am6 plus that I can run the Manjaro ARM for VIM(3) release on (xfce version, but I don’t think that matters). The Ugoos has the brcm4359 WiFi/BT chip packed in the AM6398S module, and both Bluetooth and WiFi 2.4/5GHz works just fine.
You need to locate the Manjaro package in which (most of) these files can be found (in the folder /usr/lib/firmware/brcm/):
Summary
BCM4359C0.hcd
BCM.hcd
brcmfmac4359-sdio.bin
brcmfmac4359-sdio.clm_blob
brcmfmac4359-sdio.khadas,edge-v.txt
brcmfmac4359-sdio.khadas,vim2.txt
brcmfmac4359-sdio.khadas,vim3.txt
config.txt
fw_bcm4359c0_ag_apsta.bin
fw_bcm4359c0_ag.bin
nvram_ap6398s.txt
(I don’t have the box running now.) Alternatively, you can go fishing on the interwebz for these files. After they have been put in place, a little renaming and fixing needs to be done, guided by what error messages you can (i.e. will) find in your dmesg.
Edit: The brcfmac kernel module is the one that has support for these chips, but I don’t know if that module is available in the kernel package for your board (it was for the VIM image).
Edit2: Damn, these numbers and names; I mixed up AP6359SA with AP6398S, but it is still the same procedure, and some other person (JFL) in the TV box thread has gone through the very same procedure (supposedly) for the AP6356S(A) package.