To flash to a 6.5 rom follow those steps and you will have a 99% chance of succeding. It has worked for me and I just could not flash from a 6.1 to a 6.5 rom . I would always get errors and it would get stuck at the boot screen. Following those steps fixed all my flashing problems.
1- Flash back to the stock rom
2- when it asks you to tap the screen to start customization STOP THERE! Don't do anything.
3- Now start the flashing process with your 6.5 rom and once you get to the "tap the screen to start customizing...." go for it. (Yes Activesync will still be connected to your phone even though it did not detect your phone)
4- Optionally you can clear storage after the 6.5 rom has finished customizing and loaded correctly.
I've noticed that doing that will get you pa ssed most problems flashing to a 6.5 rom.
Hope it helps
