I have an iPad app with splitview and a right bar button in the navigation bar of the detailviewcontroller.
This button calls a popover constituted of a navigation c
I'm not entirely sure I follow, because the storyboard is a bit small for me to read. But you seem in your code to have created a sparkling new popoverFirstTVC and then thrown it away by the assignment
popoverFirstTVC = segue.destinationViewController;
If you comment that line out, then at then end write
segue.destinationViewController.itsPopover = popoverFirstTVC;
then you can pass off your fully-constructed and initialised popoverFirstTVC and have code in the second VC pick it up and run with it. Of course, you need
@property (strong, readwrite) MyPopoverFirstTableViewController * itsPopover;
in the header for your second VC.