Thank you both for your answers.
I have been checking the pinout and comparing with the SenseHat, which worked properly last time I tried, but this is not a common pin among these two HATs.
I won't be able today, but I'll attach it directly to the Pi just in case. If it works, use a T-Cobbler that I have to check that it's not the cable and if it works check the soldering of the Black HAT Hack3r. I'll post my results once it's done, hope to be able to do it tomorrow.
Just a question, how could I check pin by pin that the Black HAT Hack3r is properly soldered? I believe that checking the continuity or measuring the output voltage with a multimeter but I want to be sure before testing.