Backtrack 5 to USB Issues

Many references instructions
 1.Format usb FAT32
2.With UNetbootin copy from Image ISO to USB
3. Enjoy But
that don´t work with Backtrack 5/R1-R2, then for resolve that use Universal USB Installer
References:
[1] http://www.backtrack-linux.org/tutorials/usb-live-install/
Resources:
[2] http://www.pendrivelinux.com/universal-usb-installer-easy-as-1-2-3/