Compaq Evo N610c BIOS Mod request to boot from USB

[mareliada]

Hello, sorry if this is the wrong section to post this, but I'm not really sure where it could fit it better in (and my first post here).

I've got here an old Compaq Evo N610, where the BIOS doesn't have a option (or maybe even the ability) to boot from USB devices, but I found over HP's BIOS Configuration Utility command line tool, that it has some USB boot entries (and some other device entries) in the boot list, but they are all hidden, so I tried to set all hidden devices on top of the boot list, but with no effect at all and it will always only show the CD ROM drive and and the HDD from where I can boot from (this is always available).
So I'm asking here in hope that someone knows or can maybe
mod these type of BIOS for me, but I can't find any tools and the BIOS was properly made by Compaq itself.

Here is the Windows based setup with the BIOS image included:
https://mirror.rqsall.com/ftp.compaq.com...p28069.exe

I'd be thankful if someone has an idea or can just clearly say if that is even possible at all to make it boot from USB's.