Are you sure that when dumping 14.bin you've deleted the previous 14.bin and that rrgn,14,1:/14.bin has completed successfully?
If it is so, then I don't have any other clues. We've cleaned NV and formatted the internal flash drive region 48. Region 14 seems to be okay.
So it should have started working already.

A good idea would be to find where it crashes/reboots. It would require dumping the crash log region, or even creating our own crash log handler and writing data manually to the crash log region.
It's a lot of work to do, I don't have enough time now.