1]Start ur STB
2]Press exit button two times when the screen shows "Please wait initializing" message.
After pressing the exit button two times u will see the two light indicators red and yellow glows together,this means u r going in right way
3] After pressing exit button twice press 2465 from ur stb remote
5] Let the software be downloaded and don't interrupt power supply during this process.
6] after 100% download of the software the stb will automatically restarts.
Now u r having latest software installed on ur airtel digital tv STB