Not E verified itr of previous year, can it be file now under ITR U ?

What was the last date to file ITR U for FY 20-21?

sir i had filed ITR 3 for F.Y. 2021-22 but was not able to e-verify it or post it to CPC. now that i sent it by post it shows that Return is deemed to be not filed. and while trying to file ITRU in option whether previous return filed if i select yes and enter details of previous acknowledgement portal shows invalid details and if i select no it shows the database records do not match as previous itr is uploaded. is there any solution to this problem?

As such you need to file request u/s. 119(2)(b) IT act for condonation of delay in verifying the return.

Based on the action by CPC, you can repeat these steps again, if required.