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Are you sure that you have the proper permissions to read the file from the TFTP server? Your permissions error may not be related to the Cisco device but to the file on the TFTP server (or location of the file on the server).
If it's doing the same thing when you put everything back in it's original state, it could me a couple of things. First are you absolutely sure that everything is seated properly, fully inserted, etc? Assuming it is, something may have happened to ...