Hi @asif ,
I was not able to reproduce the issue as it worked for me after following the steps mentioned here and I was able to see “hello_world” on my /dev/ttyUSB3 (sometimes port can change if they are already occupied).
Did you recheck that you downloaded the correct SDK.
Please check the similar issue
There is no modification needed in the code, it should work as it. Please recheck at your end.