I've did the update using the current HP 280 G2 MT / HP 280 G2 Pro MT System BIOS Update A0.45 Rev.A from the product page [1].
The Windows part went well: checked for compatibility, prepared the update, reboot.
During reboot a backup of the current BIOS was done, the new one saved and another reboot done.
So far all went as expected.
Problem: the pc does not display anything (including the BIOS start). I can connect to the pc by RDP and Windows reports there is no graphic card installed (previously Windows showed the internal Intel HD Graphics 530).
I've also tried different dedicated graphic cards but all were rejected with 3x long 3x short beep.
Applying the BIOS-Backup by pressing [WIN]+[B] during startup was tried, too - the expected 8x beep occured but there was no visible change. As I still can not install older BIOS versions (rejected as "not compatible", only A0.45 van be [re-]installed - without any change) I assume the new BIOS is still on the board.
Is this a known issue?
Does the BIOS provide a setting to completely turn the internal graphic card of? If yes: is it possible to turn it on using the running desktop?
[1] https://support.hp.com/us-en/drivers/selfservice/hp-280-g2-microtower-pc/8741823