1, For the obdstar machine which update service is valid, you can directly upgrade the apk to solve this problem.
2, For the obdstar machine which update service expired, please clear the cache to solve the problem, the drawback is that this problem may occur repeatedly, because there is no way to upgrade the new apk v3.8.1 after the expiration, you have to clear the cache repeatedly.
Please look at the last paragraph on how to clear the cache.
Never restore factory settings, otherwise the software will be lost and there is no way to restore it.
Guide on how to clear the cache:
Enter ” DiagProgam”, long press it and drag it into “App Info”
In the APP info, tap “Clear data” and “Yes” to confirm.
Okay, the catche is cleared, and the problem is solved. However, please keep in mind, better continue subscribing the update service and update the newest APK.