Unfortunately, if the file didn't save properly and won't open, then you will have to start again.

FYI. TurboTax CD/Download has not generated *.ttbk backup files for several years. Only the *.ttxx file is created for a return.

Que sera, sera. Thanks for trying.  The backup should be restored for the future.

I am not able to open the turbotax anymore after the upgrade. please help