This thread is three years old.
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You're wasting your time fiddling with TurboTax.
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You must have a copy of the original tax return you want to update (or a transcript).
OR, if you amended previously, a copy of the revised Form 1040 for that amendment ( no transcript is available for that)
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The simplest way is to prepare your correct tax return (using TurboTax for example, or other means) and print it.
Then lay the paper printouts of both returns (correct and original) side-by-side.
You now have all the information needed to prepare Form 1040-X by hand.
It's pretty straight-forward.
The blank form in fillable PDF format and its instructions are available at www.irs.gov.
Refer to the Instructions for what is to be attached to Form 1040-X.
Do not include your old 1040 nor your revised 1040 because the Form 1040-X reflects any changes there and becomes your new tax return.
Mail to the address shown in the Instructions.
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There are other tax prep sites on the internet that will do your prior year tax return again (federal) for no charge.
