1.Install “dosfs “ rpm in linux machine
2.Formatting the device
mkfs.vfat /dev/sdb # device name
3.Use “dd” command for making the device as bootable
Syntax
dd if=source file path of=target file path
Eg:
dd if=/opt/xxx.iso of=/dev/sdb
4.Remove the usb and reboot the system and install.
Linux Troubleshooting 