XO LAPTOP - Issue upgrading to build 767

[Christopher David Desjardins]

When trying to upgrade to the latest development build I get the 
following errors:
Trying disk:\boot-alt\bootfw.zip
Trying disk:\boot-alt\runos.zip
Trying nand:\boot-alt\bootfw.zip
Trying nand:\boot-alt\runos.zip
Boot Failed, Use power button to power off 

Also right before this I get a screen with a red warning that I have an 
unsigned key and I have a padlock in the upper right corner.  Makes me 
think I need the developer's key before I can do this?  Is this correct?

Thanks,
Chris