Hi Manoj,
Sadly, this cannot be changed in the field. Here is a paraphrase from Cisco doc's;
Access points are designed for use in many countries with varying regulatory requirements. The radios within the access points are assigned to a specific regulatory domain at the factory (such as -E for Europe), the country code ensures that each radio's broadcast frequency bands, interfaces, channels, and transmit power levels are compliant with country-specific regulations.
Hope this helps!
Rob
