s21 ultra with original firmware/bootloader

I'm looking for an S21 Ultra, unlocked, with the original firmware/bootloader. I can't find a way to contact any sellers to see if theirs is the original, un-updated (for rooting purposes). And there aren't filters for that. Anyone have any ideas? Thanks!

Look for "Need more information? Leave a comment >>" right above the shipping information on an item listing's page.

It's a little late of a reply, but I would say that you need to ask in the comments and ask Swappa for help. If they won't answer, maybe it's not something you're willing to risk. Or see what they have for a return policy. They should be answering you, though.
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