I'm glad thst helped. It doesn't always work since the accountant user needs to link the bank account which needs to be 'unreconciled' which requires downloading bank transactions.  We needed to go back more than the 18 months allowed by our bank's online portal. 

Bottom line is still that QBO has no option for everyday users to undo a bank reconciliation which is a basic function and should not require any workarounds such as adding an 'accountant' user or worse, manually editing cleared /reconciled flags.