Bricked after update

when trying to do the latest update it is now stuck. It says invalid bootloader file, sharing BOOT segment as USB drive. I used the paperclip to manually reboot then it goes back to updating but never finishes. can i get some help fixing this?

This is a problem that happens when updating a developer preview device that was using an old firmware. You can look at this thread for potential solutions, but you'll probably need to message someone from Panic to get the firmware files.