how to make a bootable USB stick

[gerald_anand]

Currently I'm using USB image tool version 1.59. I have a image with me which I need to restore it and use it as a bootable image via my USB stick.
But, when I restore the image, there is nothing inside my USB stick but the whole volume is set as used and I'm requested to reformat again if I need to use it again.
When I use this USB stick to boot my laptop, there is a message stating no operating system.
The image size is about 1.8GB and i'm using a 16GB USB drive. please help

[Alex]

USB Image Tool can't make an image bootable by itself. The image has to be made from a bootable device. When using USB Image Tool, Backup and Restore have to be made in device mode.

[gerald_anand]

But when using USB Image Tool, I ca't change it from volume mode to device mode. The drop down function to select this is frozen and is greyish. How to enable it to device mode?

[Alex]

You have to run it as administrator (right-click the exe).