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I am trying to drop and recreate sa account to reset the password.

IF  EXISTS (SELECT * FROM sys.server_principals WHERE name = N'sa')

I am getting an error

Cannot use the special principal 'sa'.

also when I try to reset sa password in SSMS, I am getting an error Cannot alter the login 'sa' because it does not exist or you don't have permission. Error: 15151

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up vote 2 down vote accepted
sp_password NULL,'new_password','sa'
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