How to update Legendary item ilvl (World of Warcraft: Legion)

Legendary items in Legion had their ilvl upgraded from 895 to 910 in the last small patch, but a lot of players don't see this reflected in their client. However, it is stored on server side, so the Legendary stats will be ilvl 910 no matter what your client shows you, so this is just a cosmetic problem.

Anyway, it's easy to fix this, and all you need to do is to go to your WoW install forlder and locate a folder named Cache. Just delete this, and the problem will be fixed!