Request for Updated Bluetooth Firmware for ASUS Lapt op (Realtek/IMC Networks – USB ID 13d3:3612)

Hello Team,

I am writing to request assistance regarding a Bluetooth issue on my ASUS
laptop when running Linux.
*Device Information*

   -

   *Vendor:* IMC Networks
   -

   *Chipset:* Realtek (identified via lsusb)
   -

   *USB ID:* *13d3:3612*
   -

   *Laptop Brand:* ASUS
   -

   *System Model:* ASUS TUF Gaming F16 FX608JH_FX608JH
   -

   *Operating System:* Linux (Kernel 6.17+, XanMod & stock kernels tested)

*Issue Description*

The Bluetooth adapter powers on, but Linux reports the following error:

Bluetooth: hci0: Failed to read codec capabilities (-22)

Because of this, Bluetooth scanning and pairing do not work at all.

It appears that the required Realtek Bluetooth firmware for this device may
be *missing or incomplete* in the current Linux linux-firmware package.
Several attempts to load newer firmware resulted in the same error.
*Request*

Could you please help with:

   1.

   Providing the *correct firmware files* for the Bluetooth module
   *13d3:3612*,
   *or*
   2.

   Confirming whether ASUS/IMC Networks can release the necessary firmware
   to the Linux community so it can be included in the upstream
   linux-firmware repository.

The diagnostics summary is attached below for your reference.

I can also provide additional logs (e.g., btmon traces) if needed.

Thank you for your time and support. I hope to help improve Linux
compatibility for this Bluetooth module.

Best regards,
*Shreyash Chaurasia*

Diagnostic Summary:

1. lsusb
Bus 001 Device 005: ID 13d3:3612 IMC Networks Bluetooth Radio
iManufacturer: Realtek
iProduct: Bluetooth Radio

2. dmesg errors
Bluetooth: hci0: Failed to read codec capabilities (-22)
usbcore: registered new interface driver btusb
HCI device detected but firmware fails to initialize

3. Kernel version
Linux 6.17.11-x64v2-xanmod1 (also failed on stock Kali kernel 6.11)

4. Firmware folder contents

/lib/firmware/rtl_bt/ contains many Realtek files (rtl8723, rtl8821, rtl8852cu, rtl8852bu, etc.)
but no firmware for rtl8852b / rtl8852be / rtl8852ce.

5. Bluetooth state
bluetoothctl scan on → SetDiscoveryFilter failed: org.bluez.Error.NotReady