各位大神；

   我现在有一台cisco 从507R-E交换机启动报下列错误请各位指点。

Checking the partition table and boot sector...Checking FAT, Files and Directories...Reclaiming unused space...Updating FAT... Rom Monitor Program Version 12.2(44r)SG5  CPU Rev: 2.1, Board Rev: 8, Board Type: 103, CPLD Nexu Rev: 9 Chassis: WS-C4507R-E Front Panel Phy is Bcm5482sGot Mac Address: 00:25:84:1e:21:fc MAC Address  : 00-25-84-1e-21-fc  Ip Address   : Not set.  Netmask      : Not set.  Gateway      : Not set.  TftpServer   : Not set. rommon 1 >rommon 1 >rommon 1 >boot File has bad file magic number:      0x0. Is it a valid file? boot: can not load "bootflash:"rommon 2 >boot bootflash:cat4500e-ipbase-mz.122-52.XO.bin File has bad file magic number:      0x0. Is it a valid file? boot: can not load "bootflash:cat4500e-ipbase-mz.122-52.XO.bin"rommon 3 >