$ dmesg|grep -i blue

[    4.043097] Bluetooth: Core ver 2.21
[    4.043110] Bluetooth: HCI device and connection manager initialized
[    4.043114] Bluetooth: HCI socket layer initialized
[    4.043116] Bluetooth: L2CAP socket layer initialized
[    4.043122] Bluetooth: SCO socket layer initialized
[    4.066490] Bluetooth: Patch file not found ar3k/AthrBT_0x00000200.dfu
[    4.066498] Bluetooth: Loading patch file failed
[    4.078553] Bluetooth: hci0: using rampatch file: qca/rampatch_usb_00000200.bin
[    4.078555] Bluetooth: hci0: QCA: patch rome 0x200 build 0x299, firmware rome 0x200 build 0x111
[    4.124923] Bluetooth: hci0: using NVM file: qca/nvm_usb_00000200.bin
[    5.051080] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[    5.051081] Bluetooth: BNEP filters: protocol multicast
[    5.051085] Bluetooth: BNEP socket layer initialized
[    9.540138] Bluetooth: RFCOMM TTY layer initialized
[    9.540148] Bluetooth: RFCOMM socket layer initialized
[    9.540154] Bluetooth: RFCOMM ver 1.11