Can't travel between Udûn and Núrn

[Ian526]

While playing in Núrn game crashed and I lost 6h of gameplay
(5 sword missions, 4 bow missions, 4 dagger missions, 3 survival challenges, 13 ithildin, 21 artifacts, 3 main missions and 2 branded warchiefs).

Plus I had to re-kill all 5 warchiefs at Udûn and redo some quest with Hirgon. There was sign that you will be able to travel between Udûn and Núrn later. So I decided to finish all main quests and after that I will redo all sidequest.

Now after finishing game I am back in Udûn. And now there on icon for traveling between Udûn and Núrn is said that you must "Complete more Main Missions to unlock".

Do I realy must restart game after 30h of gameplay to finish some sidequests?

Screenshot