This is a tutorial on Xhorse VVDI MB BE Key disassembly & installation step by step.
Or you may check full operations video to learn:
https://www.youtube.com/watch?v=LDx2DsazEA0
How to disassemble VVDI BE Key Pro?
How to install a battery in VVDI BE Key?
Read also:
How to Open Xhorse VVDI Remote Key to Replace Battery?
Hope this can help.