I thought you were asking as a matter of interest not of utility. Although that would have hardly made a difference.
If you didn't mix your backups up and if they hadn't got corrupted somehow and if they went in without a problem, then there is only one possiblity besides hardware problems.
Did you at any time "factory reset" or "wipe data"? That would be "fastboot -w" or some action under the stock recovery.
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