Im not sure if they can detect wether or not you tampered with it during downgrading, but, the chances of them sueing you are 0.
There are no grounds for a lawsuit, the worst they can do is send it back and tell you "Tuff luck, dont downgrade"
I wouldnt think they can find anything to determine the cause of bricking, especially if you told them you turned it off during a downgrade, maybe it does the same thing to it as what bricked yours.
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