Problem:
I got the xhorse dolphin xp005 mainboard replaced, then tried to restart the machine, it refused to start and there was a fault code 73990 on the small screen. Any solution?
Solution:
Delete old Dolphin APK on mobile phone
Install new APK below
https://mega.nz/file/kypHxTCS#toASAu4lqp9kymza9q9JnVXZ-EueyOXUs2v2307GIr0
Or install new APK on another phone.
Then check Device information, scroll down menu and select Turn off display.
If database language is Chinese, provide S/N to vvdishop.com to change language.