Sorry Turbo Tax Online only saves the last one done. You were suppose to save a pdf of the original return before you amended.
You can delete the amended 1040X return. After you delete it then you need to manually take out the changes you made to put your return back to the original return.
How to delete a form in the Online version
https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-forms/view-delete-forms-turbotax-onl...
