Nathan909 I have looked at firmware image for your box and it looks like there's a WiFi chip that has no driver available (probably Aigale AW-CM273SM). You will need to wait for Amlogic/Beelink to share the driver so that I can include it in my builds.
The Bellink GT1 certainly uses that device - so good possibility that the S905x MXIII II does also? (I'm waiting for one to show up, will confirm, or perhaps Nathan909 can check?
Will this link help for contact information?
AW-CM273SM_企業新聞_114ic電子網
Per the notes
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AW-CM273SM module adopts QCA9377 single chip solution. The module design is based on the QCA9377 solution.
Also found this - support for QCA9377 SDIO (ath10k or ath6kl)
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The part in question is labeled with AW-CM273SM (could be an AzureWave
module based on the name - but that is pure speculation).
According to some google hits it uses a QCA9377 chip (which would
match with the wifi-fw tarball from Amlogic which recently gained a
"qcom9377" folder).
which suggests there is an Amlogic Tarball available for the QCA9377?
Does any of that help?
edit : The last one in this list contains the 9377 - Index of /download/ARM/wifi