This is now solved. You need to build from another defconfig for x606x than x606f. So I patch the kernal defconfig and build it agin and now it works finaly. Everything excep camera seems to work.
Im going to do a pullrequst to the repo if there is any one else who has x606x and wants UT on it.

@moem I can give you instructions to build yourself or I can create a download link with the imgs to night if you are intrested.

@moem No problems. I will try to take a look and see if I can get the cameras working. And give you a download link soon.