Problems with trying to get a MacMini Server 2010 (MacMini 4,1) running a AHT

[gctwnl]

This particular MacMini 4,1 can boot with Opt-D from a AHT dowloaded via internet recovery, but after selecting the language it comes up with a panel that it is not possible to run the AHT on the machine.
On this GitHub site there are two MacMini 4,1 images, the second one containing the entire AHT. I tried both. The simple one does not work, the MacMini says it is cannot boot from it. I tried creating a bootable USB with it, but failed. That is, the installer package (EFI) works fine, but the resulting USB disk is not bootable. I'd like to find out if there is some bless command I can do on the final volume to make it be recognized as a bootable disk. If I find out what the trouble is, the information could be added to the information.