Warning: Board is not calibrated for 5.9 GHz band

After upgrade to 1.3.4 I am getting
Warning: Board is not calibrated for 5.9 GHz band" message in my configuration section of radio.?

Bishal,

This message merely indicates that the radio is not calibrated for 5.9GHz band. You will not be able to select and operate in a 5.9GHz band with this radio. However, this has no impact on the other bands. You will still be able to operate in the 5.2/5.4/5.7/5.8 band if your country code and regions allows it.”