Same problem: MPOW Bluetooth 5 dongle (Model: BH456A) $ uname -a Linux dg-dl 5.8.0-44-generic #50~20.04.1-Ubuntu SMP Wed Feb 10 21:07:30 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux $ rfkill ID TYPE DEVICE SOFT HARD 1 wlan phy0 unblocked unblocked 6 bluetooth hci0 unblocked unblocked $ lspci 00:00.0 Host bridge: Intel Corporation 4th Gen Core Processor DRAM Controller (rev 06) 00:01.0 PCI bridge: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor PCI Express x16 Controller (rev 06) 00:14.0 USB controller: Intel Corporation 8 Series/C220 Series Chipset Family USB xHCI (rev 05) 00:19.0 Ethernet controller: Intel Corporation Ethernet Connection I217-LM (rev 05) 00:1a.0 USB controller: Intel Corporation 8 Series/C220 Series Chipset Family USB EHCI #2 (rev 05) 00:1b.0 Audio device: Intel Corporation 8 Series/C220 Series Chipset High Definition Audio Controller (rev 05) 00:1c.0 PCI bridge: Intel Corporation 8 Series/C220 Series Chipset Family PCI Express Root Port #1 (rev d5) 00:1c.1 PCI bridge: Intel Corporation 8 Series/C220 Series Chipset Family PCI Express Root Port #2 (rev d5) 00:1d.0 USB controller: Intel Corporation 8 Series/C220 Series Chipset Family USB EHCI #1 (rev 05) 00:1f.0 ISA bridge: Intel Corporation C226 Series Chipset Family Server Advanced SKU LPC Controller (rev 05) 00:1f.2 RAID bus controller: Intel Corporation SATA Controller [RAID mode] (rev 05) 00:1f.3 SMBus: Intel Corporation 8 Series/C220 Series Chipset Family SMBus Controller (rev 05) 01:00.0 VGA compatible controller: NVIDIA Corporation GM107GL [Quadro K1200] (rev a2) 01:00.1 Audio device: NVIDIA Corporation GM107 High Definition Audio Controller [GeForce 940MX] (rev a1) 03:00.0 PCI bridge: ASMedia Technology Inc. Device 1182 04:03.0 PCI bridge: ASMedia Technology Inc. Device 1182 04:07.0 PCI bridge: ASMedia Technology Inc. Device 1182 05:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 15) 06:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 15) $ dmesg | grep -i blue [ 2.641328] usb 3-7: Product: Bluetooth Radio [ 6.626592] Bluetooth: Core ver 2.22 [ 6.626603] Bluetooth: HCI device and connection manager initialized [ 6.626606] Bluetooth: HCI socket layer initialized [ 6.626607] Bluetooth: L2CAP socket layer initialized [ 6.626608] Bluetooth: SCO socket layer initialized [ 6.860576] Bluetooth: hci0: RTL: examining hci_ver=0a hci_rev=000b lmp_ver=0a lmp_subver=8761 [ 6.861534] Bluetooth: hci0: RTL: rom_version status=0 version=1 [ 6.861534] Bluetooth: hci0: RTL: loading rtl_bt/rtl8761b_fw.bin [ 6.903755] bluetooth hci0: Direct firmware load for rtl_bt/rtl8761b_fw.bin failed with error -2 [ 6.903759] Bluetooth: hci0: RTL: firmware file rtl_bt/rtl8761b_fw.bin not found [ 97.431707] Bluetooth: BNEP (Ethernet Emulation) ver 1.3 [ 97.431708] Bluetooth: BNEP filters: protocol multicast [ 97.431711] Bluetooth: BNEP socket layer initialized [ 246.400802] usb 3-8: Product: Bluetooth Radio [ 246.406937] Bluetooth: hci0: RTL: examining hci_ver=0a hci_rev=000b lmp_ver=0a lmp_subver=8761 [ 246.407880] Bluetooth: hci0: RTL: rom_version status=0 version=1 [ 246.407884] Bluetooth: hci0: RTL: loading rtl_bt/rtl8761b_fw.bin [ 246.407925] bluetooth hci0: Direct firmware load for rtl_bt/rtl8761b_fw.bin failed with error -2 [ 246.407929] Bluetooth: hci0: RTL: firmware file rtl_bt/rtl8761b_fw.bin not found [ 268.373795] usb 3-6: Product: Bluetooth Radio [ 268.377141] Bluetooth: hci0: RTL: examining hci_ver=0a hci_rev=000b lmp_ver=0a lmp_subver=8761 [ 268.377947] Bluetooth: hci0: RTL: rom_version status=0 version=1 [ 268.377952] Bluetooth: hci0: RTL: loading rtl_bt/rtl8761b_fw.bin [ 268.378019] bluetooth hci0: Direct firmware load for rtl_bt/rtl8761b_fw.bin failed with error -2 [ 268.378025] Bluetooth: hci0: RTL: firmware file rtl_bt/rtl8761b_fw.bin not found [ 330.775006] Bluetooth: hci0: RTL: examining hci_ver=0a hci_rev=000b lmp_ver=0a lmp_subver=8761 [ 330.776000] Bluetooth: hci0: RTL: rom_version status=0 version=1 [ 330.776003] Bluetooth: hci0: RTL: loading rtl_bt/rtl8761b_fw.bin [ 330.776037] bluetooth hci0: Direct firmware load for rtl_bt/rtl8761b_fw.bin failed with error -2 [ 330.776040] Bluetooth: hci0: RTL: firmware file rtl_bt/rtl8761b_fw.bin not found [ 418.646117] Bluetooth: hci0: RTL: examining hci_ver=0a hci_rev=000b lmp_ver=0a lmp_subver=8761 [ 418.647121] Bluetooth: hci0: RTL: rom_version status=0 version=1 [ 418.647125] Bluetooth: hci0: RTL: loading rtl_bt/rtl8761b_fw.bin [ 418.647168] bluetooth hci0: Direct firmware load for rtl_bt/rtl8761b_fw.bin failed with error -2 [ 418.647172] Bluetooth: hci0: RTL: firmware file rtl_bt/rtl8761b_fw.bin not found [ 435.976571] usb 3-7: Product: Bluetooth Radio [ 435.980209] Bluetooth: hci0: RTL: examining hci_ver=0a hci_rev=000b lmp_ver=0a lmp_subver=8761 [ 435.981140] Bluetooth: hci0: RTL: rom_version status=0 version=1 [ 435.981143] Bluetooth: hci0: RTL: loading rtl_bt/rtl8761b_fw.bin [ 435.981169] bluetooth hci0: Direct firmware load for rtl_bt/rtl8761b_fw.bin failed with error -2 [ 435.981171] Bluetooth: hci0: RTL: firmware file rtl_bt/rtl8761b_fw.bin not found Turn on switch in settings/Bluetooth - icon remains grayed out "Bluetooth Turned Off" Reboot doesn't help. Shutdown, remove power, restart doesn't help Pull BT USB interface, reinstall/change port, doesn't help The following procedure worked for me: https://www.xmpow.com/pages/download https://mpow.s3-us-west-1.amazonaws.com/20201202_mpow_BH456A_driver+for+Linux.7z expand and cd into /20201202_LINUX_BT_DRIVER/rtkbt-firmware/lib/firmware $ sudo cp rtl8761bu_fw /lib/firmware/rtl_bt/rtl8761b_fw.bin $ sudo cp rtl8761bu_config /lib/firmware/rtl_bt/rtl8761b_config.bin $ sudo rmmod btusb $ sleep 1 $ sudo modprobe btusb Following this, I was able to turn on BT and pair with devices.