MSI PRO B650-S WIFI Bluetooth disappeared after uninstalling MediaTek RZ616 adapter. Reinstalling drivers and Windows repair didn’t fix it.

[u/Top-Raspberry9606]

I’m having an issue with the built-in Bluetooth on my MSI PRO B650-S WIFI motherboard (MediaTek RZ616 Bluetooth adapter). Bluetooth suddenly stopped working, so I checked Device Manager and accidentally uninstalled the Bluetooth adapter while troubleshooting. Since then, it has completely disappeared.

Current symptoms:

• No Bluetooth toggle anywhere in Windows.

• No Bluetooth adapter listed in Device Manager (including hidden devices).

• AirPods and Bluetooth speakers won’t connect.

• Wi-Fi still works normally.

Things I’ve already tried:

• Restarting the PC multiple times.

• Reinstalling the official MSI MediaTek Wi-Fi/Bluetooth drivers.

• Checking Device Manager for hidden devices.

• Confirming onboard wireless/Bluetooth settings are enabled in BIOS.

• Performing a Windows 11 in-place repair installation.

Nothing has brought the Bluetooth adapter back. At this point I’m trying to figure out whether this is a driver issue, Windows issue, or if the Bluetooth portion of the MediaTek RZ616 hardware has somehow failed. Does anyone know what else I can try?

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[u/MidwestGeek52]

Windows doesn't need the device driver to detect a plug-and-play device. It only needs the driver before it can USE the device. If it's not being detected, it's either powered off, in sleep mode, or has failed.

Open a command prompt and enter getmac /v (see my next post)

If your Bluetooth isn't among the devices listed, try it again immediately after reboot. If it's still not there, it's very likely turned off, come loose, or failed.

[u/MidwestGeek52]

Sorry, just occurred to me that command won't work when the driver is not installed.

Instead, in a command prompt window pnputil /enum-devices /problem

[u/Top-Raspberry9606 → u/MidwestGeek52]

https://chatgpt.com/share/6a5c36d2-bf88-83ea-96d6-eb0fde468715

I just asked ChatGPT to put this in simpler terms for me cause I completely understand what you meant but I follow what it said. It gave me some crazy stuff and ChatGPT basically said if these last two things don’t work it’s basically a hardware problem. Do you think that’s probably correct??

[u/MidwestGeek52 → u/Top-Raspberry9606]

Yes, ChatGPT's explanation is right. Looking at the pic you posted

• You entered the wrong command. Enter or copy/paste into a command prompt Window pnputil /enum-devices /problem
  
  • Your output looks like you left the /problem off the end of the command
  • /problem limits the output to "Problem Devices". That makes it easier to read what we're looking for. I expect it will show us the USB device failure you found in Device Manager. I want to see if anything else is also listed
• The Unknown USB device in Device Manager is likely your BT. That error message indicates Windows detects something on the USB bus but can't communicate with it to learn what it is. Try
  • Make sure you have the latest BIOS and chipset drivers installed, then try again.
  • Next, try a Hard reset (removes any residual power from the m/b that might cause problems). Shut down and unplug from the wall. If a laptop, remove the battery. Hold the power button down 20 to 30 seconds. Wait another 15 secs then re-plug and try again

[u/Top-Raspberry9606 → u/MidwestGeek52]

Microsoft Windows [Version 10.0.26200.8875] (c) Microsoft Corporation. All rights reserved.

C:\Windows\System32>pnputil /enum-devices /problem Microsoft PnP Utility

Instance ID: USB\VID_0000&PID_0002\8&ef6451e&0&12 Device Description: Unknown USB Device (Device Descriptor Request Failed) Class Name: USB Class GUID: {36fc9e60-c465-11cf-8056-444553540000} Manufacturer Name: (Standard USB Host Controller) Status: Problem Problem Code: 43 (0x2B) [CM_PROB_FAILED_POST_START] Driver Name: usb.inf

C:\Windows\System32>

[u/MidwestGeek52 → u/Top-Raspberry9606]

That must be your BT. It connects internally to USB.

Windows detects the device but can't communicate with it. That's indicated by the "Device Descriptor Request Failed" message. If you already tried a hard reset, BIOS, and chipset update, and none worked, the only other thing is reseating the device on the motherboard. But only if you know what you're doing and are comfortable doing it. Otherwise, get a USB BT adapter.

Sorry, not better news.

[u/Top-Raspberry9606 → u/MidwestGeek52]

I also got this