@Sudesh You cannot change the FIRMWARE on the TV to get the different country, it is actually changed by a setting, or by using a "service remote" (can be purchased from Amazon).
Have a read of this article, and if your TV is an "Asian" variant/build, then you MIGHT be able to select "India" this way, if not, you may have to obtain a service remote, and use the India country/area code that is 4816.
https://help.simpletelly.com/article/395-changing-lg-service-country-region-on-lg-tv-webos