Bitlocker - Networkunlock with 8770w

Hello,

i have a problem with a 8770 workstation.

Im using Bitlocker with Networkunlock and it works with new Clients (HP ZBook 17 g1/g2/g3 HP 850 G1/G2/g3) but with the 8770w i get the pin request every time.

I updated the BIOS to F.63 Rev.A:

http://h20564.www2.hp.com/hpsc/swd/public/readIndex?sp4ts.oid=5257515&swLangOid=18&swEnvOid=4060

I found computer requirements:

• A DHCP driver that is implemented in the UEFI firmware
• Trusted Platform Module (TPM) 1.2 or TPM 2.0

Is there a UEFI firmware upgrade for this model with an implemented dhcp driver?

Thanks!

Regards!