In the event that you run the updater.app and receive the BL.2005 error, that means the volume is not identified as a bootable volume.  You will have to open the terminal.app and run the following command:


sudo bless --folder /Volumes/RECON\ Imager\ Newer\ Macs/.IABootFiles/ --file /Volumes/RECON\ Imager\ Newer\ Macs/.IABootFiles/boot.efi --label "RECON Imager Newer Macs"


Then re-run the updater.app and the update should be successful.