Bluetooth macbook air (2015) not turning on

Hi,

i have a macbook air with Mac OS 12.6

The bluetooth is not turning on anymore. I saw several topics in the community with the same issue but nothing helped.

What did i do:

bluetooth reset not working with sudo pkill bluetoothd and restart.

resetting NVRAM and SMC not working.

reinstall mac OS

all did not help, i still cant turn on the bluetooth.

the hardware overview is giving the followin information:

Bluetooth Controller:

Address: NULL

State: Off

Chipset: BCM_4350C2

Discoverable: Off

Firmware Version: v0 c0

Product ID: 0x0001

Supported Devices: 0x382039 < HFP AVRCP A2DP HID Braille AACP GATT Serial >

Transport: USB

Vendor ID: 0x004C (Apple)

hope someone has a fix to turn it on again. Thanks in advance!