first boot press f10 reset bios to factory defaults and exit, 2nd boot reset security settings to defaults.
you can permanently disable absolute in BCU. Use BCU to fill these DMI info:
Serial Number: 5CG2421G1G
Product #/SKU: 4V0T4EP#ABB
CT Number: PKPSH00WBH915Z
Description: HP EliteBook 850 G8 Notebook
BuildID: 21WWCVET601#SABB#DABB
Feature Byte: 476J6S6b7B7H7M7Q7W7m7saBaEapaqauawbUbhcAdpdqfPguhKhkjhk8mEmwn7nVngpDpq.Rm
MAC Address : 60:6D:3C:F6:03:F5
you can permanently disable absolute in BCU. Use BCU to fill these DMI info:
Serial Number: 5CG2421G1G
Product #/SKU: 4V0T4EP#ABB
CT Number: PKPSH00WBH915Z
Description: HP EliteBook 850 G8 Notebook
BuildID: 21WWCVET601#SABB#DABB
Feature Byte: 476J6S6b7B7H7M7Q7W7m7saBaEapaqauawbUbhcAdpdqfPguhKhkjhk8mEmwn7nVngpDpq.Rm
MAC Address : 60:6D:3C:F6:03:F5
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