Good to have a dedicated forum back again shame about ITUS but they may do a phoenix rising from the ashes.
Right your bad CRC is normal, I have two Shields both with the same warning. I have one shield which refused to boot and so I put my technical head on and started to dig around.
The Shield uses a program called uboot which i is coded into the chip, this sets up some very basic but complicated stuff to then load and run Octboot2bin which is located on the shield and can be upgraded ( i think).
Then Octoot2bin gives control over to u-boot-octeon_rhin0_itus7x.bin ( this is the name on 1.51 sp1 firmware but is different on rc1 release). It's this programs which loads ITUSRouterImage ( if your in router mode) and i believe that because the memory is clear it flags the warning.
Hope this helps.
It would be good if we could have sections for beginner and experts.