I already spotted that the Sony CXD2820 is a DVB-T tuner. The problem is the driver. For the this Fortis model two different DVB-T tuners were sold. The early model does not support DVB-T2. It has a Sony CXD2820 tuer and a Samsung 5SH1432 demodulator. Both the driver and the datasheet for the latter are confidential and for that reason are not part of the image I can offer. As far as I know a driver can be found in Bpanthers' Neutrino images, but this will not solve your problem, as only the later DVB-T tuner supports DVB-T2. At present I do not know which chips it is based on.
In the past I have started work on a driver for the older model, but my tuner module broke down while working on the driver. These tuner modules are hard to find, as the majority of the receivers were sold and used with 2x DVB-S(2) as tuners and this receiver model is slowly coming of age and re-/disgarded as obsolete, although it is my favourite Fortis model.
Regards,
Audioniek.