Yes, you can generally file your income tax return (ITR) for the last two years. If you've received a notice from the IT department, you can file based on the notice details. For other situations, you might be able to file an ITR-U under section 139(8A). If you have a refund pending for a past assessment year, there's a specific procedure to follow, which may involve filing a condonation request and making an additional tax payment using Challan 280.
No you can't file ITR-U for taking the refund. For taking refund there is a separate procedure now. If you need any help then you can check your inbox.
Need to make an additional tax payment under sec 140 b, whether can i make payment by using challan 280, same like self assessment tax or any other challan , or any other procedure , kindly advise