IMO 3 firmware files are missing:
dvb-demod-si2168-b40-01.fw
dvb_driver_si2157_rom50.fw
dvb-tuner-si2157-a30-01.fw
You could find them here: https://github.com/CoreELEC/dvb-firmware/tree/master/firmware
Possible installation in TrueNAS: https://forums.truenas.com/t/adding-firmware-to-the-lib-firmware-folder/35001
I haven’t done this yet, so be patient.