Hi, My 440 G7 is completely bios locked - no Halt Codes and only hard drives with an already installed OS seem to boot - various types of UEFI USBs including the official windows media tool just cause a reboot. A Serco watermark shows but im not sure if its their lock or just initial user.

HP ProBook 440 G7
8VU02EA#ABU

Build: 19WWR4CT601#SABU#DABU
BIOS: S71 Ver. 01.21.00 - 04/12/2024
Serial: 5CD1011JT6
Byte: 3X476J6S6b7B7J7M7Q7W7m7saBapaqauawbUbhcAdUdpdqfPk8.he

Ive tried running 'files' themselves, HBPR and a simple system and settings...