Common issue as i have researched. Bluetooth device cannot be found at all.
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root@falsodebian:~# cat /etc/debian_version
9.4
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root@falsodebian:~# lspci -nnk | grep -iA3 net; lsusb; hciconfig -a; rfkill list all; dmesg | egrep -i 'blue|firm'
08:00.0 Network controller [0280]: Qualcomm Atheros AR9485 Wireless Network Adapter [168c:0032] (rev 01)
Subsystem: Lite-On Communications Inc AR9485 Wireless Network Adapter [11ad:6608]
Kernel driver in use: ath9k
Kernel modules: ath9k
09:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [10ec:8168] (rev 07)
Subsystem: Toshiba America Info Systems RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [1179:fb37]
Kernel driver in use: r8169
Kernel modules: r8169
Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 004: ID 04f2:b307 Chicony Electronics Co., Ltd
Bus 001 Device 006: ID 1058:1100 Western Digital Technologies, Inc. My Book Essential Edition 2.0 (WDH1U)
Bus 001 Device 005: ID 045e:0745 Microsoft Corp. Nano Transceiver v1.0 for Bluetooth
Bus 001 Device 003: ID 05e3:0606 Genesys Logic, Inc. USB 2.0 Hub / D-Link DUB-H4 USB 2.0 Hub
Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 008: ID 1f75:0888 Innostor Technology Corporation IS888 SATA Storage Controller
Bus 004 Device 010: ID 04e8:61b5 Samsung Electronics Co., Ltd M3 Portable Hard Drive 2TB
Bus 004 Device 009: ID 1058:259f Western Digital Technologies, Inc.
Bus 004 Device 007: ID 2109:0812 VIA Labs, Inc. VL812 Hub
Bus 004 Device 006: ID 2109:0812 VIA Labs, Inc. VL812 Hub
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 010: ID 05ac:2405 Apple, Inc.
Bus 003 Device 011: ID 1210:0002 DigiTech
Bus 003 Device 009: ID 2109:2812 VIA Labs, Inc. VL812 Hub
Bus 003 Device 008: ID 2109:2812 VIA Labs, Inc. VL812 Hub
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
-bash: rfkill: command not found
[ 0.162633] ACPI: [Firmware Bug]: BIOS _OSI(Linux) query ignored
[ 2.646419] [Firmware Bug]: ACPI(VGA) defines _DOD but not _DOS
[ 2.675607] usb 3-3: Product: Bluetooth USB Host Controller
[ 2.818934] radeon 0000:01:00.0: firmware: direct-loading firmware radeon/TURKS_pfp.bin
[ 2.819318] radeon 0000:01:00.0: firmware: direct-loading firmware radeon/TURKS_me.bin
[ 2.819879] radeon 0000:01:00.0: firmware: direct-loading firmware radeon/BTC_rlc.bin
[ 2.820222] radeon 0000:01:00.0: firmware: direct-loading firmware radeon/TURKS_mc.bin
[ 2.820402] radeon 0000:01:00.0: firmware: direct-loading firmware radeon/TURKS_smc.bin
[ 2.823839] radeon 0000:01:00.0: firmware: direct-loading firmware radeon/SUMO_uvd.bin
[ 3.049026] Bluetooth: Core ver 2.22
[ 3.049042] Bluetooth: HCI device and connection manager initialized
[ 3.049045] Bluetooth: HCI socket layer initialized
[ 3.049048] Bluetooth: L2CAP socket layer initialized
[ 3.049054] Bluetooth: SCO socket layer initialized
[ 3.069016] usb 3-3: firmware: failed to load ar3k/AthrBT_0x01020200.dfu (-2)
[ 3.069129] usb 3-3: Direct firmware load for ar3k/AthrBT_0x01020200.dfu failed with error -2
[ 3.069132] Bluetooth: Loading patch file failed
[ 3.855175] r8169 0000:09:00.0: firmware: failed to load rtl_nic/rtl8168e-3.fw (-2)
[ 3.855180] r8169 0000:09:00.0: Direct firmware load for rtl_nic/rtl8168e-3.fw failed with error -2
[ 3.855183] r8169 0000:09:00.0 enp9s0: unable to load firmware patch rtl_nic/rtl8168e-3.fw (-2)
[ 7.246389] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[ 7.246390] Bluetooth: BNEP filters: protocol multicast
[ 7.246393] Bluetooth: BNEP socket layer initialized