How to use Xhorse vvdi mb tool?

How to use vvdi mb tool? (use tips,feedback)
http://blog.xhorsevvdi.com/tag/vvdi-mb-tool/

How to use vvdi mb tool? - youtube
https://www.youtube.com/watch?v=3v7rJlDqWDI&list=PLdPt2pnUfLJ4eZWymiXT2pFPEwO9VfUzJ

Xhorse VVDI MB BGA Tool Benz Key Programmer Including BGA Calculator Function Free Shipping:

Support all key lost,Mainly used for key reading and writing,EIS tools,password calculation,key file preparing,ESL tools,ECU/Gearbox renew and many special functions