I tried with several open source applications but I am getting target device not found.
my system USB and pendrive both are working condition.
Please let me know exact process for making pendrive as bootable.
The applications you're using almost certainly work but your BIOS needs two changes - one to set USB Legacy Support so there is power to the ports at boottime and secondly, it needs to capable of booting from a USB device. Some BIOS setups cannot do that.