How can I change the password without my other device
I hv only this device and how to change my apple password
iPhone SE, iOS 14
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If you know the current password.
What to do after you change your Apple ID or password - Apple Support - I suggest doing this before you change your Apple ID or password.
If you forgot the Apple ID (iCloud) password, enter the Apple (iCloud) ID, and click Forgot Password. See if you can get a Rescue or Notification email option if necessary. Link to contact Apple Support at the end of the 2nd article.