Hi @spikerguy,
Installed the new linux-khadas-5.15.10-1 kernel on GT King Pro to replace mainline linux-5.15.10-1 and wifi is no longer available with this errors:
[ 9.780416] brcmfmac: brcmf_chip_recognition: chip backplane type 5 is not supported
[ 9.780429] brcmfmac: brcmf_sdio_probe_attach: brcmf_chip_attach failed!
[ 9.780432] brcmfmac: brcmf_sdio_probe: brcmf_sdio_probe_attach failed
[ 9.780536] brcmfmac: brcmf_ops_sdio_probe: F2 error, probe failed -19...
The firmware for wifi as far as I can tell are all available at /lib/firmware/brcm:
brcmfmac4356-sdio.bin
brcmfmac4356-sdio.txt
brcmfmac4356-sdio.clm_blob
Wonder whether you had the same issue with linux-khadas kernel on your GT King Pro. Bluetooth and Ethernet is working.
Edit: Switch to linux-5.15.7-1, wifi is available with the same firmware (same as in linux-5.15.10-1).