How to change the protect cipher algorithm and the digest algorithm of the secret key?

[Gao Xiaohui]

Hello,
Excuse me,When using "gpg --list-packets [private secret key file]",it print "iter+salt S2K, algo: 7, SHA1 protection, hash: 2, salt: ****************", how to change "algo:7" and "hash:2"?
I searched on Google, it use the "gpg --gen-key" or "gpg --edit-key" command with "--s2k-cipher-algo AES256" and "--s2k-digest-algo SHA512" options could change them, but I tested,It could not change them. Tell me  the correct way please.Thank you very much.
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