If you want to Amend a 2020 State Return that was not filed with TurboTax, you will either need to do so manually, or download the State into your 2020 TurboTax File to Amend it using TurboTax.
If you choose to do this, you'll have to enter all your state info from your original filing in order to Amend.
Here's more info on Error 190 and How to Amend a Tax Return.
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