LAUNCH X431 CRP919 serial error solution: “Serial number has not been registered”

ccidentally it may happen to your LAUNCH X431 CRP919E device “Serial number has not been registered” issue. At this time, what should we do? Here we provide 2 solutions to fix the error.   Check Device Version Settings >> About >> Version   Solution 1. If the APP version is lower than V1.07_2.14, tap “Clear up” first, then