I don't have any useful information to help you with, but I absolutely hate the x4. When I first got it, it locked up halfway thru loading the tune. I thought my car was bricked. Spent hours on the phone with their support over two days, they finally got it to work. Recently I have had it give me an error multiple times including today. Sometimes it works, sometimes it doesn't. It is scary every single time I use it. Today I finally got it to work by hooking the battery up to my other car's battery via jumper cables, but that could have just been a coincidence. I never would bother attempting loading a tune anywhere but at home for fear of rendering the car undriveable. I've seen way too many horror stories of people having issues with it. I would have to say I'm stupid for continuing to use it instead of upgrading.
Good luck getting yours figured out.