Tvheadend

firmware download failed -22

post result of

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

You're missing dvb-demod-si2168-b40-01.fw.

Try¹

cd /lib/firmware && sudo wget http://palosaari.fi/linux/v4l-dvb/firmware/Si2168/Si2168-B40/4.0.25/dvb-demod-si2168-b40-01.fw
sudo reboot

¹ omit sudo if already root.

ohh I did not notice that failed

The problem is that it already have that file in the /lib/firmware
But I did download it again and restart the computer and here is the dmesg

[    0.029698] Spectre V2 : Enabling Restricted Speculation for firmware calls
[    0.088063] usbcore: registered new interface driver usbfs
[    0.088071] usbcore: registered new interface driver hub
[    0.088089] usbcore: registered new device driver usb
[    1.352955] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002
[    1.353846] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[    1.354729] usb usb1: Product: EHCI Host Controller
[    1.355610] usb usb1: Manufacturer: Linux 4.15.0-50-generic ehci_hcd
[    1.356513] usb usb1: SerialNumber: 0000:00:1a.0
[    1.380950] usb usb2: New USB device found, idVendor=1d6b, idProduct=0002
[    1.381828] usb usb2: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[    1.382698] usb usb2: Product: EHCI Host Controller
[    1.383562] usb usb2: Manufacturer: Linux 4.15.0-50-generic ehci_hcd
[    1.384429] usb usb2: SerialNumber: 0000:00:1d.0
[    1.394913] usb usb3: New USB device found, idVendor=1d6b, idProduct=0002
[    1.395726] usb usb3: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[    1.396561] usb usb3: Product: xHCI Host Controller
[    1.397376] usb usb3: Manufacturer: Linux 4.15.0-50-generic xhci-hcd
[    1.398204] usb usb3: SerialNumber: 0000:00:14.0
[    1.403673] usb usb4: New USB device found, idVendor=1d6b, idProduct=0003
[    1.404498] usb usb4: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[    1.405315] usb usb4: Product: xHCI Host Controller
[    1.406126] usb usb4: Manufacturer: Linux 4.15.0-50-generic xhci-hcd
[    1.406937] usb usb4: SerialNumber: 0000:00:14.0
[    1.692112] usb 1-1: new high-speed USB device number 2 using ehci-pci
[    1.728113] usb 2-1: new high-speed USB device number 2 using ehci-pci
[    1.848863] usb 1-1: New USB device found, idVendor=8087, idProduct=0024
[    1.849940] usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[    1.884539] usb 2-1: New USB device found, idVendor=8087, idProduct=0024
[    1.885610] usb 2-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[    2.140134] usb 1-1.1: new high-speed USB device number 3 using ehci-pci
[    2.249667] usb 1-1.1: New USB device found, idVendor=0b48, idProduct=3015
[    2.250769] usb 1-1.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[    2.251848] usb 1-1.1: Product: TechnoTrend USB2.0
[    2.252934] usb 1-1.1: Manufacturer: CityCom GmbH
[    2.253999] usb 1-1.1: SerialNumber: 20151107
[    2.332134] usb 1-1.3: new full-speed USB device number 4 using ehci-pci
[    2.443560] usb 1-1.3: New USB device found, idVendor=0b05, idProduct=17dc
[    2.444666] usb 1-1.3: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[    2.445734] usb 1-1.3: Product: Bluetooth Radio 
[    2.446780] usb 1-1.3: Manufacturer: Realtek 
[    2.447803] usb 1-1.3: SerialNumber: 00e04c000001
[   18.549337] usbcore: registered new interface driver btusb
[   18.782867] bluetooth hci0: Direct firmware load for rtl_bt/rtl8821a_config.bin failed with error -2
[   19.024135] usb 1-1.1: dvb_usb_v2: found a 'TechnoTrend TT-connect CT2-4650 CI v1.1' in warm state
[   19.024357] usb 1-1.1: dvb_usb_v2: will pass the complete MPEG2 transport stream to the software demuxer
[   19.024373] dvbdev: DVB: registering new adapter (TechnoTrend TT-connect CT2-4650 CI v1.1)
[   19.025796] usb 1-1.1: dvb_usb_v2: MAC address: bc:ea:2b:65:04:98
[   19.204279] si2168 8-0064: firmware version: B 4.0.2
[   19.613982] usb 1-1.1: DVB: registering adapter 0 frontend 0 (Silicon Labs Si2168)...
[   19.880192] rc rc0: TechnoTrend TT-connect CT2-4650 CI v1.1 as /devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.1/rc/rc0
[   19.880239] input: TechnoTrend TT-connect CT2-4650 CI v1.1 as /devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.1/rc/rc0/input8
[   19.880334] usb 1-1.1: dvb_usb_v2: schedule remote query interval to 300 msecs
[   19.880339] usb 1-1.1: dvb_usb_v2: 'TechnoTrend TT-connect CT2-4650 CI v1.1' successfully initialized and connected
[   19.880391] usbcore: registered new interface driver dvb_usb_dvbsky
[   26.072468] dvb_ca_en50221: dvb_ca adapter 0: DVB CAM detected and initialised successfully
[   33.230973] si2168 8-0064: downloading firmware from file 'dvb-demod-si2168-b40-01.fw'
[   33.230976] si2168 8-0064: firmware download failed -22
[   33.272056] si2157 9-0060: firmware version: 3.0.5
[   33.272080] usb 1-1.1: DVB: adapter 0 frontend 0 frequency 0 out of range (42000000..870000000)
[   33.281248] si2168 8-0064: downloading firmware from file 'dvb-demod-si2168-b40-01.fw'
[   33.281251] si2168 8-0064: firmware download failed -22
[   34.453781] dvb_ca_en50221: dvb_ca adapter 0: DVB CAM detected and initialised successfully

Hmm still same error
I maybe have to upgrade the kernel but not sure what version?

check there's no .fw.1 files in /lib/firmware.

Hmm that was one .1

dvb-demod-si2168-b40-01.fw.1

so I did remove it but did make sure it was a

dvb-demod-si2168-b40-01.fw

in the folder
and then reboot the system but same error in the dmesg

Carsten Johansson wrote:

Hmm that was one .1

[...]

so I did remove it but did make sure it was a
[...]

in the folder
and then reboot the system but same error in the dmesg

delete both and redownload again.

ahh now it looks likes it working

It have to be another version that I found