If you look here [Link Redacted by Moderators] You can see someone claiming to be able to downgrade their console. I am wondering if this is actually legit and has it been confirmed/tested by one of you?
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There isn't a way to "downgrade", there is a firmware revert though which is possible to revert back to a previous firmware but you would need to have done a hardware syscon backup while on the firmware you want to revert to.
TL;DR - no you can't downgrade.
Not possible without a dump and exploit.