Since I had told you previously that I use win_7, I don’t have Hyper Terminal in my computer. So, I googled this problem & got a solution that says, just copy the hyperterm.exe & hyperterm.dll file from any xp installed computer & put those in your program files. I did & it worked actually. This is how I am being able to connect to the microcontroller using Hyper Terminal. But still I don’t know how to copy that HEX file into the microcontroller. Plz Help.