Nokia recommends that the boot loader file on all 7705 SAR platforms be upgraded using a specific command. This command is mandatory on all 7705 SAR platforms that do not have a removable compact flash drive and is part of a mechanism that protects the boot loader file from accidental overwrites on these platforms.
The command checks that the new boot.ldr file is a valid image and that it is at least a minimum supported variant for the hardware platform on which it is being loaded. Once this has been verified, the command overwrites the boot.ldr file that is stored on the system.