Tvheadend

Type: dmesg | grep DVB

See if there are any error messages that may give a clue to the problem

I tried running the command via SSH from Putty and nothing happened, did I type it correctly? (screenshot attached)

Try with

dmesg -T |egrep "firmware|dvb|frontend|usb" 

To be more easy unplug wait 5 sec and plug it again.

Output is listed below:

[Fri Nov 6 10:20:40 2020] raspberrypi-firmware soc:firmware: Attached to firmwa re from 2020-10-22 14:06, variant start
[Fri Nov 6 10:20:40 2020] raspberrypi-firmware soc:firmware: Firmware hash is 7 4e754ff8947c58d2773253f77f6f68a303188f8
[Fri Nov 6 10:20:40 2020] usbcore: registered new interface driver usbfs
[Fri Nov 6 10:20:40 2020] usbcore: registered new interface driver hub
[Fri Nov 6 10:20:40 2020] usbcore: registered new device driver usb
[Fri Nov 6 10:20:41 2020] usbcore: registered new interface driver lan78xx
[Fri Nov 6 10:20:41 2020] usbcore: registered new interface driver smsc95xx
[Fri Nov 6 10:20:42 2020] dwc_otg 3f980000.usb: DWC OTG Controller
[Fri Nov 6 10:20:42 2020] dwc_otg 3f980000.usb: new USB bus registered, assigne d bus number 1
[Fri Nov 6 10:20:42 2020] dwc_otg 3f980000.usb: irq 56, io mem 0x00000000
[Fri Nov 6 10:20:42 2020] usb usb1: New USB device found, idVendor=1d6b, idProd uct=0002, bcdDevice= 5.04
[Fri Nov 6 10:20:42 2020] usb usb1: New USB device strings: Mfr=3, Product=2, S erialNumber=1
[Fri Nov 6 10:20:42 2020] usb usb1: Product: DWC OTG Controller
[Fri Nov 6 10:20:42 2020] usb usb1: Manufacturer: Linux 5.4.72-v7+ dwc_otg_hcd
[Fri Nov 6 10:20:42 2020] usb usb1: SerialNumber: 3f980000.usb
[Fri Nov 6 10:20:42 2020] usbcore: registered new interface driver usb-storage
[Fri Nov 6 10:20:42 2020] usbcore: registered new interface driver usbhid
[Fri Nov 6 10:20:42 2020] usbhid: USB HID core driver
[Fri Nov 6 10:20:42 2020] usb 1-1: new high-speed USB device number 2 using dwc _otg
[Fri Nov 6 10:20:43 2020] usb 1-1: New USB device found, idVendor=0424, idProdu ct=9514, bcdDevice= 2.00
[Fri Nov 6 10:20:43 2020] usb 1-1: New USB device strings: Mfr=0, Product=0, Se rialNumber=0
[Fri Nov 6 10:20:43 2020] usb 1-1.1: new high-speed USB device number 3 using d wc_otg
[Fri Nov 6 10:20:43 2020] usb 1-1.1: New USB device found, idVendor=0424, idPro duct=ec00, bcdDevice= 2.00
[Fri Nov 6 10:20:43 2020] usb 1-1.1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[Fri Nov 6 10:20:43 2020] smsc95xx 1-1.1:1.0 eth0: register 'smsc95xx' at usb-3 f980000.usb-1.1, smsc95xx USB 2.0 Ethernet, b8:27:eb:bd:63:87
[Fri Nov 6 10:20:43 2020] usb 1-1.2: new full-speed USB device number 4 using d wc_otg
[Fri Nov 6 10:20:43 2020] usb 1-1.2: New USB device found, idVendor=046d, idPro duct=c52b, bcdDevice=12.03
[Fri Nov 6 10:20:43 2020] usb 1-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[Fri Nov 6 10:20:43 2020] usb 1-1.2: Product: USB Receiver
[Fri Nov 6 10:20:43 2020] usb 1-1.2: Manufacturer: Logitech
[Fri Nov 6 10:20:43 2020] input: Logitech USB Receiver as /devices/platform/soc /3f980000.usb/usb1/1-1/1-1.2/1-1.2:1.0/0003:046D:C52B.0001/input/input0
[Fri Nov 6 10:20:43 2020] hid-generic 0003:046D:C52B.0001: input,hidraw0: USB H ID v1.11 Keyboard [Logitech USB Receiver] on usb-3f980000.usb-1.2/input0
[Fri Nov 6 10:20:43 2020] input: Logitech USB Receiver Mouse as /devices/platfo rm/soc/3f980000.usb/usb1/1-1/1-1.2/1-1.2:1.1/0003:046D:C52B.0002/input/input1
[Fri Nov 6 10:20:43 2020] input: Logitech USB Receiver Consumer Control as /dev ices/platform/soc/3f980000.usb/usb1/1-1/1-1.2/1-1.2:1.1/0003:046D:C52B.0002/inpu t/input2
[Fri Nov 6 10:20:43 2020] input: Logitech USB Receiver System Control as /devic es/platform/soc/3f980000.usb/usb1/1-1/1-1.2/1-1.2:1.1/0003:046D:C52B.0002/input/ input3
[Fri Nov 6 10:20:43 2020] hid-generic 0003:046D:C52B.0002: input,hiddev96,hidra w1: USB HID v1.11 Mouse [Logitech USB Receiver] on usb-3f980000.usb-1.2/input1
[Fri Nov 6 10:20:43 2020] hid-generic 0003:046D:C52B.0003: hiddev97,hidraw2: US B HID v1.11 Device [Logitech USB Receiver] on usb-3f980000.usb-1.2/input2
[Fri Nov 6 10:20:44 2020] usb 1-1.5: new high-speed USB device number 5 using d wc_otg
[Fri Nov 6 10:20:44 2020] usb 1-1.5: New USB device found, idVendor=0413, idPro duct=6029, bcdDevice= 2.00
[Fri Nov 6 10:20:44 2020] usb 1-1.5: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[Fri Nov 6 10:20:44 2020] usb 1-1.5: Product: WinFast DTV Dongle Gold
[Fri Nov 6 10:20:44 2020] usb 1-1.5: Manufacturer: Leadtek
[Fri Nov 6 10:20:44 2020] input: Leadtek WinFast DTV Dongle Gold as /devices/pl atform/soc/3f980000.usb/usb1/1-1/1-1.5/1-1.5:1.1/0003:0413:6029.0004/input/input 5
[Fri Nov 6 10:20:44 2020] hid-generic 0003:0413:6029.0004: input,hidraw3: USB H ID v1.01 Keyboard [Leadtek WinFast DTV Dongle Gold] on usb-3f980000.usb-1.5/inpu t1
[Fri Nov 6 10:20:52 2020] usbcore: registered new interface driver brcmfmac
[Fri Nov 6 10:20:52 2020] usb 1-1.5: dvb_usb_v2: found a 'Leadtek WinFast DTV D ongle Gold' in cold state
[Fri Nov 6 10:20:52 2020] usb 1-1.5: Direct firmware load for dvb-usb-af9015.fw failed with error -2
[Fri Nov 6 10:20:52 2020] usb 1-1.5: dvb_usb_v2: Did not find the firmware file 'dvb-usb-af9015.fw' (status -2). You can use <kernel_dir>/scripts/get_dvb_firmw are to get the firmware
[Fri Nov 6 10:20:52 2020] dvb_usb_af9015: probe of 1-1.5:1.0 failed with error -2
[Fri Nov 6 10:20:52 2020] usbcore: registered new interface driver dvb_usb_af90 15
[Fri Nov 6 10:20:52 2020] brcmfmac mmc1:0001:1: Direct firmware load for brcm/b rcmfmac43430-sdio.raspberrypi,3-model-b.txt failed with error -2
[Fri Nov 6 10:20:53 2020] logitech-djreceiver 0003:046D:C52B.0003: hiddev96,hid raw0: USB HID v1.11 Device [Logitech USB Receiver] on usb-3f980000.usb-1.2/input 2
[Fri Nov 6 10:20:53 2020] input: Logitech Unifying Device. Wireless PID:4024 Ke yboard as /devices/platform/soc/3f980000.usb/usb1/1-1/1-1.2/1-1.2:1.2/0003:046D: C52B.0003/0003:046D:4024.0005/input/input6
[Fri Nov 6 10:20:53 2020] input: Logitech Unifying Device. Wireless PID:4024 Mo use as /devices/platform/soc/3f980000.usb/usb1/1-1/1-1.2/1-1.2:1.2/0003:046D:C52 B.0003/0003:046D:4024.0005/input/input7
[Fri Nov 6 10:20:53 2020] input: Logitech Unifying Device. Wireless PID:4024 Co nsumer Control as /devices/platform/soc/3f980000.usb/usb1/1-1/1-1.2/1-1.2:1.2/00 03:046D:C52B.0003/0003:046D:4024.0005/input/input8
[Fri Nov 6 10:20:53 2020] input: Logitech Unifying Device. Wireless PID:4024 Sy stem Control as /devices/platform/soc/3f980000.usb/usb1/1-1/1-1.2/1-1.2:1.2/0003 :046D:C52B.0003/0003:046D:4024.0005/input/input9
[Fri Nov 6 10:20:53 2020] hid-generic 0003:046D:4024.0005: input,hidraw1: USB H ID v1.11 Keyboard [Logitech Unifying Device. Wireless PID:4024] on usb-3f980000. usb-1.2/input2:1
[Fri Nov 6 10:20:54 2020] input: Logitech K400 as /devices/platform/soc/3f98000 0.usb/usb1/1-1/1-1.2/1-1.2:1.2/0003:046D:C52B.0003/0003:046D:4024.0005/input/inp ut13
[Fri Nov 6 10:20:54 2020] logitech-hidpp-device 0003:046D:4024.0005: input,hidr aw1: USB HID v1.11 Keyboard [Logitech K400] on usb-3f980000.usb-1.2/input2:1
[Fri Nov 6 10:22:44 2020] usb 1-1.2: USB disconnect, device number 4
[Fri Nov 6 10:30:39 2020] usb 1-1.5: USB disconnect, device number 5
[Fri Nov 6 10:30:46 2020] usb 1-1.4: new high-speed USB device number 6 using d wc_otg
[Fri Nov 6 10:30:46 2020] usb 1-1.4: New USB device found, idVendor=0413, idPro duct=6029, bcdDevice= 2.00
[Fri Nov 6 10:30:46 2020] usb 1-1.4: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[Fri Nov 6 10:30:46 2020] usb 1-1.4: Product: WinFast DTV Dongle Gold
[Fri Nov 6 10:30:46 2020] usb 1-1.4: Manufacturer: Leadtek
[Fri Nov 6 10:30:46 2020] usb 1-1.4: dvb_usb_v2: found a 'Leadtek WinFast DTV D ongle Gold' in cold state
[Fri Nov 6 10:30:46 2020] usb 1-1.4: Direct firmware load for dvb-usb-af9015.fw failed with error -2
[Fri Nov 6 10:30:46 2020] usb 1-1.4: dvb_usb_v2: Did not find the firmware file 'dvb-usb-af9015.fw' (status -2). You can use <kernel_dir>/scripts/get_dvb_firmw are to get the firmware
[Fri Nov 6 10:30:46 2020] dvb_usb_af9015: probe of 1-1.4:1.0 failed with error -2
[Fri Nov 6 10:30:46 2020] input: Leadtek WinFast DTV Dongle Gold as /devices/pl atform/soc/3f980000.usb/usb1/1-1/1-1.4/1-1.4:1.1/0003:0413:6029.0006/input/input 14
[Fri Nov 6 10:30:46 2020] hid-generic 0003:0413:6029.0006: input,hidraw0: USB H ID v1.01 Keyboard [Leadtek WinFast DTV Dongle Gold] on usb-3f980000.usb-1.4/inpu t1

[Fri Nov 6 10:20:52 2020] usb 1-1.5: dvb_usb_v2: found a 'Leadtek WinFast DTV D ongle Gold' in cold state
[Fri Nov 6 10:20:52 2020] usb 1-1.5: Direct firmware load for dvb-usb-af9015.fw failed with error -2
[Fri Nov 6 10:20:52 2020] usb 1-1.5: dvb_usb_v2: Did not find the firmware file 'dvb-usb-af9015.fw' (status -2). You can use <kernel_dir>/scripts/get_dvb_firmw are to get the firmware
[Fri Nov 6 10:20:52 2020] dvb_usb_af9015: probe of 1-1.5:1.0 failed with error -2

missing firmware

dvb-usb-af9015.fw

Any guide for how I can compile the firmware in Raspberry Pi OS?

Glen Brickwood wrote:

Any guide for how I can compile the firmware in Raspberry Pi OS?

Read more carefully dmesg message

You can use <kernel_dir>/scripts/get_dvb_firmw are to get the firmware

Or
google > "dvb-usb-af9015.fw download"

then
google > "where to download dvb tuner firmware on raspberry"

If you can compile firmware everybody will ask you

Thankyou very much, this is solved now!