iphone restore from computer backup
how do I reset my backup encryption password in itunes???
iPhone XS, iOS 14
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You can create a new password for encrypted backups but you cannot reset the password to unlock a backup that has a forgotten password associated with it. The new password will only work for a new backup but it will not allow you to use the old backup.
See this for more information. Specifically you want to read the section about not being able to remember the password.
About encrypted backups on your iPhone, iPad, or iPod touch - Apple Support