Hello,
where is it possible to buy or order a micro USB adapter with the 8mm head? Or such a thin head, that it fits into the BV6000 cover?
Thanks in advance.

Best regards
Fetz

You can buy them on online retailers like Amazon (horribly over priced, like $15-20 a cable) or Aliexpress for cheaper but long shipping times.

Or just take a regular cable, a razor and just trim back the plastic like a 1/8 of an inch and it'll plug right into. Did that with my bv5000, and it works well. Your cell (and my me one in the mail) uses the same cable.