Yeah, i tried the original USB with XPEnology on it, no cigar
I believe the Terramaster bootloader installs to HDD after the initial setup and probably checks if the USB pen is installed when running (or not)...
Fact is, my Bios has the boot order menu locked, so i cannot change it.
I already installed other OS's, but they all boot from HDD. XPEnology requires the pen to boot from and then launch the OS, so it does not work on this version of the hardware...
The only option i can see, is if XPEnology bootloader copies it self to a dedicated partition of the HDD to be able to boot and then load the OS from another partition. Leaving the original boot pen inside, so the security checks can be made.