Reply to Defective Return

SIR

I RECEIVED NOTICE OF DEFECTIVE INCOME TAX RETURN FOR ASSESSMENT YEAR:2020-21 ON 1.09.2021. THE  RESPONSE OF THE ABOVE RETURN IS TO BE FILLED WITHIN 16.09.2021. BUT DUE TO TECHNICAL PROBLEM IN INCOME TAX WEBSITE , I AM  UNABLE TO UPLOAD THE CORRECT ITR.

SO, PLS TELL ME HOW I CAN UPLOAD THE CORRECT ITR?