Is it possible to unreconcile a bank account in QB and start again. I have realised that the bank reconciliation that has been previously done is incorrect.
As far as I know, and it has worked for me..., is click reconcile -> then 'undo last reconciliation'.
It will warn you about what's going to happen, and what the figures will revert to. If you want to go further back then just rinse and repeat the above till you get back to the start.