If you are a dual status alien (and it certainly seems that you were) then there is no other choice. For the period that you were a non-resident, though, you would exclude foreign income so that seems to have been done correctly. While TurboTax does not support a dual status return it may be that everything was correct on the amended return so you won't have to file another amendment. You should contact Sprintax and see what they say.
Here are the IRS rules on dual status aliens.
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