Keydiy KD-X4 BMW BDC3 Key Copy Error B7 Solution

Problem:

Tried to copy a BMW G series BDC3 key using Keydiy KD-X4 but failed. KD-X4 cannot collect key data, device says error B7.

Solution:

It can be firmware or app version issue.

Update both KD-X4 firmware and KD App to latest version.

And try again.