TC51 OEM Bootloader Unlock

My company and I recently purchased a few TC-51's that we are going to use for development. We need to be able to load a custom bootloader however, it looks like the bootloader is locked even with developer options enabled. When I attempt to add our bootloader with the Android fastboot utility, it looks like it requires a passphrase. Does anyone know what I need to do or whom I need to talk to?