Hi,
first of all the device needs to be set up into DVB-C or DVB-T/T2 mode - this is usually done with the sundtek control center.
Second of it the Blindscan feature is currently the same for DVB-C and DVB-T (because the DVB-T options are currently not exposed to the user).
DVB-T/T2 officially does not support hardware based Blindscan with the new devices, the devices are just able to scan DVB-T/T2 very fast so there's no noticeable difference but T/T2 would need some information eg. start frequency, stop frequency, frequency step at the moment we set up default values for Germany.
I think those values should be adjustable via the Controlcenter within the next updates.
Regular blindscan on the console, on any linux system:
/opt/bin/mediaclient --blindscan /dev/dvb/adapter0/frontend0
or in case of settopboxes
/opt/bin/mediaclient --blindscan NIMSOCKETNUMBER