Default Access Indian Marketplace

Hi, can anyone tell me how to make my device permanently access the Indian marketplace ...
Everytime I flash my mobile , I will set the locale and other settings to English (India), but after sometime instated of seeing the apps in rupees I am seeing in dollars...
Please help me fix this

Secondly what's the importance of radio firmware's ? What does it bring to the device? .. Is it important to update the radio firmware ?