Hello,
The best way to recover your cards depends on whether they had personal annotations. Please choose the option that fits your situation:
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If the cards didn’t have any personal annotations, you can recover them by resetting local changes as the bot suggested: How to Reset Local Changes
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If the cards did have changes made by you and you want to get those edits back, I recommend restoring your collection from a backup: How to Restore from Backup
Hope this helps you find the right solution! 