Income tax return of last 4 year can be filed ?

Firstly returns are time barred and can be filed against notice received u/s 142(1).

If notice is received, it can be filed using e-form by putting in details if notice u/s 142(1)

Dear Darpan,

I fail to understand one thing.  How many times are you going to ask the same question in this very forum.  The answer to this question was provided to you in Detail earlier too!!

AS PER SEC 139(4), A BELATED RETURN CAN BE FILED BY THE ASSESSE WITHIN 1 YEAR FROM THE END OF THE ASSESSMENT YEAR. HENCE, IN YOUR CASE, ASSESSE CAN FILE INCOME TAX RETURN FOR AY 11-12, AY 12-13. BUT NOT FOR THE PREVIOUS YEARS.

agree with Mr. Ca pracheta