If you want to do it on your own, you can un-reconcile each transaction last month and reconcile them again. If you have a firm user, they can undo the entire reconciliation at once.
Let me know if you have more questions. Have a good one!
Hello @Iddrisu Wumpini.
The firm user that was referred by my colleague above was an accountant. They have the specific tools that undo the entire reconciliation in a few clicks in QuickBooks Online (QBO).
You can give them access to your QBO company file and accounting info. This lets them review your books, make corrections, and fix any tricky transactions. It also makes it easier to collaborate, especially during tax season.
If you don't have one, you can find them by clicking this link here: https://quickbooks.intuit.com/au/find-a-proadvisor/
If there's anything else you need, you're always welcome here in the Community to post again. We'll be always around ready to help.