how can i burn .hex files to avr microcontrollers using 10 pin ISP header available in arduino (nepaluino) that i have ?
First you'll have to determine if the 10-pin ISP header has the same six signals as the Arduino ISP header. To do that you will either need a schematic (none to be found on nepaluino.com) or you will need to trace the circuits.
Good luck.