Can't install Mojave on an external drive

Hi,

I'm trying to install Mojave on an external drive, it's an ADATA SU650 480GB in a ADATA ED600 rack. I'm using a HP Omen 15-ce008nq laptop, for this one i want to use, and when I'm trying to install, I see no other drives can be seen by mac installer, other than flash drive and the external drive.

When I go on with the installer, I can't select any drive (flash drive or external one), i get this message: you may not install to this volume because the computer is missing a firmware partition.

Tried booting with -v and I've noticed it hanging at "could not recover sata hdd after 5 attempts, terminating" and trying a buch of times.

What can be the problem and do you have any suggestions to make it work?

Thank you!

submitted by /u/HopTzop
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