Appendices : Troubleshooting : Firmware image is corrupted

Firmware image is corrupted
Information in Boot file location gives an administrator who knows the root password enough background to be able to boot from an alternate image if the need arises and if the Web Manager is not available.
Network boots are recommended for troubleshooting only. For example, if you want to test a new release of the software to make sure a problem is fixed, or if the removable Flash memory becomes corrupted, you could download the software to a tftpboot server. After you test the image and replace the Flash, if needed, you can then save the image to the removable Flash using the create_cf command.
You can use the create_cf command when troubleshooting problems with the boot image, as described under To upgrade to a boot image from a network boot in U-boot monitor mode:.