Income Tax E-filing Portal has posted an update that:
E-filing of Updated ITR u/s 139(8A) has been enabled for AY 2020-21 and AY 2021-22 using Excel utility for ITR 1 and 4. Refer details in News section. Please click Downloads | Income Tax Department to access and download the same for clicking respective AY folder. Once Updated ITR is prepared, you can upload the XML/JSON by logging into Income-tax website.