Bios updating option
Using this boot option might require modifying the drive geometry to match how the BIOS has been hard-coded to see the device.
The USB-ZIP boot option may allow you to boot some larger capacity flash drives without drive geometry modification, if your BIOS also lists the flash drive as a selectable hard drive under boot priority.
In which case, you can press a specific key (F2, F10, F11 or ESC) during system post to access the "Boot Menu".
There may be others but this is meant to be a simple checklist to familiarize you with the boot options and which ones to use.The file-system used may also affect the BIOS's ability to detect and boot the drive. The partition must also be active or the device will not boot.