Do you have a printed copy of your 2020 return? If so, use it and just go to Forms mode in the 2020 software to make the corrections to get it back to the way it was before you accidentally changed things. Then you can use it to transfer in to a new 2021 return. Remember that the transfer of 2020 to 2021 has to be done at the very beginning before you enter any other new information for 2021.
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
