How to upload backup
How to upload back up but it keeps asking for my passcode to an iPhone I no longer have
iPhone 11, iOS 14
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As long as you remember the passcode for it, just enter it. Doesn't matter if you no longer have it physically. Some content in the backup may be encrypted and would need the passcode to decrypt it since it's used as the encryption key.
If you don't remember the passcode, then you will not be able to restore that backup.