The “Unit boot from” pull-down menu lists the “Network” option for booting from a TFTP boot server on the network along with one or two boot images that reside on the OnBoard. Two options appear (“Network” and “Image1”), as shown in the following figure, if only one boot image is found on the OnBoard.Settings Æ Boot Configuration Æ Unit Boot MenuThe default image stored on the OnBoard is shown in the example with the name Image1:uImage.V_1.0.0a-Sep_20_05. A second image appears in the list only if the software has been upgraded.