UBoot/MiniBoot Update (Alcatel Switch)

I'm upgrading this OmniSwitch 9702. I'm stuck on the uboot/miniboot upgrade. The process goes as follows:

1. Transfer uboot.bin and miniboot.boot to /flash
   
   1. Execute command "update uboot-miniboot"
      
   2. When update complete; delete uboot/miniboot files from /flash
      
   3. Execute "reload working no rollback-timeout"
      

Could someone provide insight as to why we must delete those files and reboot the switch after transferring them? This doesn't seem logical.