As all corrections in TDS returns depend upon consolidated fvu file. Consolidated fvu files can be arranged only after successful TAN Registration at www.tin-nsdl.com. Tan Registration process is also available here (Click here). On login for Tan registration, request for consolidated fvu file can be made through TDS/TCS link as shown in below picture. Some time we found that consolidated fvu file takes time in email. But through status of "Request Link", it can be immediately downloaded as shown in given picture.
In the above image, it is clear that NSDL has not sent email for requested consolidated fvu, I mean to say file is under process but download link named "Click here to download" is available.