How to update all BibTex citation keys at once?

I'm new to BibTex and just installed the BBT add-in to my Zotero.

When it installed, it automatically generated keys for all the entries in my libraries according to the default.

I've since changed the citation format, and all new references I've added have this new, different format.

Is there a way for me to automatically update all of the old keys to the format I have now?

Thanks for any help!
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