thanks for the info; it's seems nothing changed also with your method; i tried with another nano (programmed etc) but the mast cal value is lost...anyone has CEC 1.200 and ubitx v5 and has the same problem?
Another solution i can try: recover original firmware, set calibration and re-update to CEC 1.200 firmware; if the problem is caused by a little bug in the software (he can't write in the E2PROM) i think will work (because with firmware upgrade the cal value is not touched)
Thanks for support guys
