Please see LinaJ's instructions above for how to amend your federal return. You will need to complete your 1040NR with Sprintax , print it, attach it to your 1040X before mailing.
Please go to your state website for information on how to amend your state return. Maybe Sprintax can help you amend your state return.
Please see the following IRS Topic Returning an Erroneous Refund so you can return the stimulus payment you received.
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