Amend 1120s to 1120 using turbo tax 2018

[nv1975]

Hi,

I got a letter from IRS that I have filed 1120s instead of 1120. I remember selecting s-crop while filing for FEIN.  What do you think the best approach would be? should I ask IRS 2013-30 to approve my s-corp? or should I just amend with 1120? If amend is the better approach , how do I do that in Turbotax 2018? I have Turbotax business 2018 premier.

Regards

Naveen.