I tried to use 1500 MHz version, but it seems that it has worse S21 measurement, I'm not sure, may be this is just a bad calibration, but original firmware works better. So I flashed original one.
I tested also S11 and it seems that it is a little usable up to 1200 MHz (with S11 smaller than 15 dB). Above 1200 MHz it has terrible distortions and almost unusable. Actually I don't need 900-1200 MHz range, so I rollback to original firmware. :)
