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You can undo your previous reconciliation by clicking the undo last reconciliation button. Let me walk you through the step-by-step process.
Once done, manually correct and reconcile each transaction. Please see these articles for your guidance.
Reconcile an account in QuickBooks Desktop.
I'm also attaching our page about banking and bank feeds for QuickBooks Desktop for tips and recommendations for your future tasks.
Should you have other questions or concerns, please let me know. I'll be around for you. Thanks for visiting us today and have a good one.