[Android Head-Units] fumbreisa:
Hi. I'm 8667Q noob. I see the title about partitions and the interesting things you are talking about. I learn.

However, reading the "intention" of the OP, the bluetooth, it matches some of my 8667Q experience and I wish I could contribute some useful info.

I struggle with myself to make myself understandable, so I will try to write in a simple way.

8667Q

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Same behavior > Non-bluetooth devices > Connect > Paired > Disconnected

USB

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I know is not the "same" firmware as 8667Q / 825X / 8226L, so maybe unrelated. Just in case, I read users unable to connect ADB wifi or USB until enable "USB2 Debug" on factory settings.

Root

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I couldn't obtain # > ADB command: not allowed > $. The same with Termux. Still thinking.

su @#zxcvbnmasdfghjklowertyuiop1234567890,.

Junsun V1 - Rescue the status bar

As soon as I start an app which was installed by myself the Android status bar is hidden: That's not the case if I start an pre-installed app like Radio, Playstore, Settings. Any idea what I can do? Already tried to change immersive settings...

xdaforums.com

Build.prop

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TorstenH's JunSUnShell app can modified it without root on 8667Q / 825X / 8226L.

JunSUnShell - execute root commands on Junsun head units

JunSUnShell Execute SU / root commands without ADB and without preparations like rooting the device. First app prototype tested on MTK8257 and MT8667 devices (see below). Looking for supporters who are interested to use and test this app.

xdaforums.com

Helped me to change a value on it to show always the status bar, so if the app is helpful here, he sure will be happy to attend your request there for your advanced needs, as he does.

FYT Joying

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I have read +- this worked topic, where they couldn't connected bt devices, with several solutions for bluetooth. Although fyt has 2 Bluetooth apks and I think that the solutions are related with them.

Q&A, tips, info Roll-up (Joying) FYT SC9853i

Last revised: 09 May 2020. The models are manufactured/assembled by Joying, but the motherboard/MCU is made by FYT who also "make" the Android and system apps for the units. There are a number of FYT compatible units available, like Joying...

xdaforums.com

If I understood something:

• Do something with root: I can't be root, then is not my case, so not well read.

• Install a modified full bluetooth app: I think only for OBD not f.e. earbuds.

On my 8667Q I tried to mod mtkbluetooth apks but nothing. Now forgotten what nonsense I did with apks so must recheck.

• And without root, with a config.txt, and the value "sys.fyt.bluetooth_type=0".

The number is for different profiles. I think that with 0 they change the bt apk to use. This way are able to connect keyboards.

I don't know how to "translate" the values in build.prop. On 8667Q only see one "bt" value.

ro.vendor.mtk.bt_sap_enable=true

But I have no idea. Only from what I read you, so I behaved well.

I don't want to derail the partitioning issue, but reading you point other issues too, I hope this helps somewhat, if only with bluetooth. And I'd better start shutting up or I'll make a mess.

If you want me to review something useful, I might be able to.

Bye.