Just perfect tx 4 all
After some tests, my model was completely unable to switch data frequency. I couldn't even choose between 3g and 4g, and of course it was impossible to select 2600Mhz or something different. To select anything else than Auto was to see the complete loss of the network. Alas, in auto, I had between 20 and 50% less speed connection than with my good old B715... Return to sender and refund. Bad luck ? Maybe...
perfect, but you should be very very patient