At this point you have a brick. Try reapplying the update and see if it works.
It's a crash with the bootloader. Somewhat like a comp without the MBR(or a manual MBR). On the device you pretty much have to tell it where to boot. I tried flashing mine back to ICS from JB, received the same cdt.bin fail. I had to flash it with the JB SBF. However, it failed, but not on the cbt.bin. It failed on 7 logo.gif. This was able to get it to boot properly, but I still had to factory reset to resolve some issues.
I am currently waiting on an UPDATED SBF, because I believe the one I have is an older version of JB and not the latest.