Thanks for the reply.
It has started appearing in the panel intermittently and started functioning intermittently. I did nothing... May be there's something wrong but not completely.
The replies to the above commands are as below:
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hciconfig -a
hci0: Type: Primary Bus: USB
BD Address: A0:A8:CD:CC:99:93 ACL MTU: 1021:5 SCO MTU: 96:5
UP RUNNING PSCAN ISCAN
RX bytes:2049 acl:0 sco:0 events:208 errors:0
TX bytes:30326 acl:0 sco:0 commands:207 errors:0
Features: 0xff 0xfe 0x0f 0xfe 0xdb 0xff 0x7b 0x87
Packet type: DM1 DM3 DM5 DH1 DH3 DH5 HV1 HV2 HV3
Link policy: RSWITCH HOLD SNIFF
Link mode: SLAVE ACCEPT
Name: 'yagya-desktop'
Class: 0x1c0104
Service Classes: Rendering, Capturing, Object Transfer
Device Class: Computer, Desktop workstation
HCI Version: 4.0 (0x6) Revision: 0x500
LMP Version: 4.0 (0x6) Subversion: 0x500
Manufacturer: Intel Corp. (2)
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rfkill list
0: hci0: Bluetooth
Soft blocked: no
Hard blocked: no
1: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
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dmesg | egrep -i 'blue|firm'
[ 0.028383] Spectre V2 : Enabling Restricted Speculation for firmware calls
[ 0.059199] ACPI: [Firmware Bug]: BIOS _OSI(Linux) query ignored
[ 24.220136] iwlwifi 0000:02:00.0: loaded firmware version 17.948900127.0 op_mode iwlmvm
[ 24.225303] Bluetooth: Core ver 2.22
[ 24.225320] Bluetooth: HCI device and connection manager initialized
[ 24.225324] Bluetooth: HCI socket layer initialized
[ 24.225326] Bluetooth: L2CAP socket layer initialized
[ 24.225332] Bluetooth: SCO socket layer initialized
[ 24.243792] Bluetooth: hci0: read Intel version: 370710018002030d00
[ 24.304433] Bluetooth: hci0: Intel Bluetooth firmware file: intel/ibt-hw-37.7.10-fw-1.80.2.3.d.bseq
[ 24.426790] Bluetooth: hci0: Intel firmware patch completed and activated
[ 29.798390] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[ 29.798393] Bluetooth: BNEP filters: protocol multicast
[ 29.798396] Bluetooth: BNEP socket layer initialized
[ 44.186039] Bluetooth: RFCOMM TTY layer initialized
[ 44.186044] Bluetooth: RFCOMM socket layer initialized
[ 44.186049] Bluetooth: RFCOMM ver 1.11