Return under 44 ab can be revised under section 44 ad

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Y

As per query I assume that you have filed return with a tick mark against 44AB but audit not carried out.

Now you desire to revise return using 44AD section.

You can not shift now to 44AD bcoz that option you need to exercise at the of filing return only.

However few views are there that you can do so by filing revised return (thereby avoiding Tax audit).

You may take a chance and file revised return in ITR4 in response to 139(9) notice.