I'm not sure if this makes a difference, but I've run the same utility on my SX60 to dump firmware (EXIF tags claim firmware 1.00 rev 2.00, which I assume is 1.00B). primary.bin is the same up through offset 0x15a00ff, after which it differs (an md5sum of the first 22675712 bytes of both files is cad0e6d985269120925c49840beb3357).
If necessary, I can put my fw dump online as well.