Bluetooth internal adapter issue

Configuration
1

Hello community,

Since my former homelab server crashed, I had to change it.
I managed to setup a new one and everything works just fine except : I can’t get the bluetooth internal adapter to work in Home Assistant.

I have Proxmox on my server, I do USB passthrough to the VM where I have HAOS. Everything is at the latest version possible right now (proxmox 9, HA 2026.4.3 …).

I can see on my HA with lsusb that it sees the BT adapter: Mediatek Inc. Wireless_Device

And I can see it fails to load the driver in dmesg:

bluetooth hci0: Direct firmware load for mediatek/mt7925/BT_RAM_CODE_MT7925_1_1_hdr.bin failed with error -2
Bluetooth: hci0: Failed to load firmware file (-2)
Bluetooth: hci0: Failed to set up formware (-2)

I have noticed the file was missing in /lib/firmware so I did put it there. Still not working.

I have found this link from 2023 stating a missing firmware file in HA but it was solved back then so I assume it should work ?!

I know I could stop trying and put an ESP BT Proxy, and will eventually if I can’t solve this but I would really prefer to have my server doing the job for the room it is in.

Any ideas ?

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Can’t help you much because I’m not very familiar with bluetooth, but I did have a look at the OS code by following your link.

Looks like the MT7925 isn’t supported by the OS. If you look here, you’ll see that only the 7921 & 7922 are listed.

EDIT: Looks like someone requested support for it a couple of years ago Bluetooth Integration Does Not Recognise MediaTek MT7925 (Missing Support/Driver) · Issue #3676 · home-assistant/operating-system · GitHub

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Thank you very much for taking some time to try and help me.
You are right, I digged so deep and for so long that I missed that the thread I refer to is not on the same version … Thanks !

Ok so now I have an answer, it seems it will be supported in kernel 6.13 and today in the HAOS 17 it is with kernel 6.12 so I guess I’ll plug an ESP BT Proxy and wait for HAOS to move on.

Again, thank you so much for your help !

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