btcrecover
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if xprv.startswith(b"xprv"): # BIP32 extended private key version bytes
if xprv.startswith(b"xprv"): # BIP32 extended private key version bytes
If you have an xprv then you don't need BTCRecover. What are you attempting to do?
Looks like duplicate of https://github.com/3rdIteration/btcrecover/issues/457