I am experiencing this known issue. Pretty frustrating. Can't play the new content with my friends. Honestly it's kinda game breaking, at least in my opinion because I have to grind just to get 690 unlike everyone not affect by the bug. Please fix this and give the players who got -blam!- by this bug something to boost them up father than 690 to where the rest of the player base will be at by that time. Like at least 720.
Which of the boost gear pieces are you missing? What part of the questline are you on? What steps have you taken to try and resolve your issue? You didn't give much information in your post to go on, so please do give a bit more information on exactly what issue you're having and why you feel you're having it.