iphoneの機種変更後、ログインをしましたが、データがすべて消えていました。バックアップ記録もありません。復元方法を教えてください。
Unfortunately it appears you were not syncing with AnkiWeb, and your account expired. You may be able to recover your data from one of your other devices: AnkiWeb account removal - Frequently Asked Questions
If you accidentally overwrote the data on your other devices by syncing in the wrong direction, you may be able to recover from a backup on one of those devices: Restoring an Automatic Backup (Recovering from Data Loss) - Frequently Asked Questions
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