You should remplace all the bz* files on your flash drives with one pulled from the release you are using. You can get the files in the zip here : https://unraid.net/download
This worked for me! Somehow my bzfirmware file got corrupted and replacing it worked immediately.
Boot Failure: bzfirmware checksum error
in General Support
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This worked for me! Somehow my bzfirmware file got corrupted and replacing it worked immediately.