5.9.0-kali5-amd64 #1 SMP Debian 5.9.15-1kali1 (2020-12-18) x86_64 GNU/Linux

After kali linux installation(dual boot:windows 10 & kali) I tried opening bluetooth manager and adapter GNU, but both did not open up. so i tried opening them up in terminal and got the following issue:
Code:
 $ blueman-manager
blueman-manager version 2.1.4 starting
blueman-manager 02.47.12 ERROR    Manager:118 on_dbus_name_appeared: Default adapter not found, trying first available.
blueman-manager 02.47.12 ERROR    Manager:122 on_dbus_name_appeared: No adapter(s) found, exiting

$blueman-adapters
blueman-adapters version 2.1.4 starting
blueman-adapters 02.53.32 ERROR    Adapter:53 __init__  : No adapter(s) found
output for command lsusb:
Code:
$ lsusb 
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 002: ID 13d3:56c9 IMC Networks HP TrueVision HD Camera
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 003: ID 0bda:b00c Realtek Semiconductor Corp. 802.11ac WLAN Adapter
Bus 001 Device 002: ID 093a:2510 Pixart Imaging, Inc. Optical Mouse
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Code:
$ hciconfig 
hci0:   Type: Primary  Bus: USB
        BD Address: 20:4E:F6:51:E5:90  ACL MTU: 1021:6  SCO MTU: 255:12
        DOWN 
        RX bytes:2068 acl:0 sco:0 events:189 errors:0
        TX bytes:32654 acl:0 sco:0 commands:189 errors:0
as hci0 is down i tried the following
Code:
$ sudo hciconfig hci0 up               
Can't init device hci0: Protocol not supported (93)
didn't worked

Also the hcitool shows no device
Code:
$ hcitool  dev                                                                                              1 ⨯
Devices:
Code:
$ sudo dmesg | grep -i blue
[   14.844206] Bluetooth: Core ver 2.22
[   14.844224] Bluetooth: HCI device and connection manager initialized
[   14.844231] Bluetooth: HCI socket layer initialized
[   14.844233] Bluetooth: L2CAP socket layer initialized
[   14.844236] Bluetooth: SCO socket layer initialized
[   15.215644] Bluetooth: hci0: RTL: examining hci_ver=0a hci_rev=000c lmp_ver=0a lmp_subver=8822
[   15.218620] Bluetooth: hci0: RTL: rom_version status=0 version=3
[   15.218621] Bluetooth: hci0: RTL: loading rtl_bt/rtl8822cu_fw.bin
[   15.347187] bluetooth hci0: firmware: direct-loading firmware rtl_bt/rtl8822cu_fw.bin
[   15.347212] Bluetooth: hci0: RTL: loading rtl_bt/rtl8822cu_config.bin
[   15.347240] bluetooth hci0: firmware: failed to load rtl_bt/rtl8822cu_config.bin (-2)
[   15.347247] bluetooth hci0: Direct firmware load for rtl_bt/rtl8822cu_config.bin failed with error -2
[   15.347257] Bluetooth: hci0: RTL: cfg_sz -2, total sz 31416
[   15.747654] Bluetooth: hci0: RTL: fw version 0x09993aa1
[   33.465614] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[   33.465617] Bluetooth: BNEP filters: protocol multicast
[   33.465622] Bluetooth: BNEP socket layer initialized
[ 1438.441520] Bluetooth: hci0: RTL: examining hci_ver=0a hci_rev=0999 lmp_ver=0a lmp_subver=3aa1
[ 1438.441525] Bluetooth: hci0: RTL: unknown IC info, lmp subver 3aa1, hci rev 0999, hci ver 000a
[ 1438.441527] Bluetooth: hci0: RTL: assuming no firmware upload needed
[ 3978.306133] Bluetooth: hci0: RTL: examining hci_ver=0a hci_rev=0999 lmp_ver=0a lmp_subver=3aa1
[ 3978.306140] Bluetooth: hci0: RTL: unknown IC info, lmp subver 3aa1, hci rev 0999, hci ver 000a
[ 3978.306142] Bluetooth: hci0: RTL: assuming no firmware upload needed
in the above it says "bluetooth hci0: Direct firmware load for rtl_bt/rtl8822cu_config.bin failed with error -2"
i tried 'sudo apt-get install firmware-realtek' but everything is up-to-date.
Code:
─$ bluetoothctl    
Agent registered
[bluetooth]# scan on
No default controller available
The internal realtek bluetooth works fine in windows 10 and i abled to start ,restart and stop the bluetooth service in terminal.so it seems no problem with bluetooth
Code:
$ sudo service bluetooth start 
$ service bluetooth status
● bluetooth.service - Bluetooth service
     Loaded: loaded (/lib/systemd/system/bluetooth.service; enabled; vendor preset: disabled)
     Active: active (running) since Sat 2021-01-09 02:16:04 IST; 58min ago
       Docs: man:bluetoothd(8)
   Main PID: 2536 (bluetoothd)
     Status: "Running"
      Tasks: 1 (limit: 6905)
     Memory: 684.0K
        CPU: 23ms
     CGroup: /system.slice/bluetooth.service
             └─2536 /usr/libexec/bluetooth/bluetoothd
$ sudo service bluetooth restart
ran 'rfkill' ,nothing was blocked
Code:
$ rfkill         
ID TYPE      DEVICE      SOFT      HARD
 0 wlan      phy0   unblocked unblocked
 1 bluetooth hci0   unblocked unblocked
I am finding very difficult to figure out the problem as a newbie(will become professional one day &nbsp
I think the blueman is not recognising the bluetooth, i tried removing and reinstalling blueman package[didn't work]

do i need any additional driver installation for realtek bt,please help me resolving the issue.
Code:
$ uname -srvo                                                                                                                                                1 ⨯
Linux 5.9.0-kali5-amd64 #1 SMP Debian 5.9.15-1kali1 (2020-12-18) GNU/Linux
using hp pavilion gaming laptop 15-ec0101AX