Xhorse Dolphin XP005 73990 Error Solution

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.