I have been using the clear Uldum to Yog trick and create a group on group finder. So all my alts can skip to him. But I have been trying that on ICC 25 Heroic and it isnt working. Any advice? or does it just not work there?
Kill 11/12 (or 10/12 if you skip healing boss) on NORMAL, doesn't matter if 10m or 25m normal. Group up your two characters and go inside at 25m NORMAL. Swap to 25m heroic inside.
Should work unless it got changed today. And it's Ulduar, not Uldum.
Now that I think of it, clearing may be possible on any of the 4 difficulties. Just need to enter at 25m normal and swap to 25m heroic inside with the other char. Oh well, clearing 10m normal is easiest every week so that's what I do.