biskeydump continues to be updated by scene developer @rajkosto, which is a custom 'payload' designed to dump all your Switch BIS keys for usage with later on with eMMC contents decryption on your desktop or laptop, and his latest version 7 build has been updated to handle all the new TSEC changes made recently by big 'N' with their v6.20 firmware release!
rajkosto said:
biskeydump v7 is out for those who need to get their tsec/bis keys while on 6.2.0, also adds option to save keys to a file on microsd
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PLEASE NOTE: This only helps in backing up your NAND that been updated to v6.2.0 and making changes to it like downgrading, etc., it does NOT help in getting the new special keys needed for CFW on v6.2.0!