After furnishing the return, if an assessee discovers any omission or any wrong statement in the return filed, he may file a revised return, subject to the condition that, the original return was filed within due date.  An individual is required to file his return of income by 31^st July of the assessment year.

Return can be revised at any time before the expiry of one year from the completion of the said assessment year orbefore the completion of assessment, whichever is earlier. It is also possible to revise a revised return provided it is revised within the prescribed time.

Now whether you have to file revised return or not depends on the modifications you noticed, kindly mention them.

If any person having furnished a return under 139(1), discovers any ommission or any wrong statement therein, he may furnish a revised return....

According to my knowledge you should go for revised return whether you have despathched the signed copy of the Acknowlegment to CPC ,bangalore or NOT....!!

Revised the return and despatched the same (i.e. Original and Revised) together....

you need to file revised return..

Agree with Vishnupriya and Sanket,

You need to file revised return and send both copies to Banglore..