Coscar, I realize it was mentioned before, but I’ve had no less than four people try my BLF A6 and go “I think it’s broken” so I have to ask, did you make sure that you’re properly cycling through the modes?
The half press is like second nature after a while to most people here but it can be confusing/seemingly impossible to people that are new to the idea.
Again, if this is construed as insulting or patronizing I assure you it is not. That being said, give the light one full press until you hear a click, then press far enough that you almost click it but release, then repeat. It’s better to find out now if that’s the problem or if you have a bigger issue.
I’ve been modifying lights for about four years now and I can’t even begin to tell you how many times I’ve slapped myself for forgetting something simple. I’ll give you a story to hopefully amuse you while your dealing with the frustration:
About three years ago (roughly) I showed a friend of mine a freshly modified 4D maglite I had built. It ran on regular alkalines, had a three mode driver, and the option of a modified aluminum reflector or an aspheric lens I found that would fit the bezel. In short, it was the bomb at the time.
He asked me if I could build him one, so I thought about it and since I had the parts on hand I said ok. A few days later, he had his three mode 4D maglite in his hand and we were playing around with it in his back yard. Several family members were very impressed etc. He put it down while he ran inside for a minute, then came back out as some of our other friends were pulling into the driveway. This is where the problem started.
As they parked and got out of their car, he grabbed it and turned it on, and a very dim glow was all that happened. He turned it off and handed it to me. I quickly turned it on and got the same, something had to be wrong 
I took the head off the light and tried again, same thing, uh oh! We went inside and yanked out the heatsink which was practically press fit in (anyone else use some of Britelumens stuff when it was around?) and checked the wiring, everything looked good.
We turned the light off and started talking about possible reasons for the issue and I clicked the light on absentmindedly and BOOM full power.
We were in low mode the whole time, the driver had mode memory and I didn’t understand how it worked so it never occurred to me that it would come back on in low even if it had been turned off! (These days you can pick if you want mode memory and how it memorizes modes, but even if they had the option back then I didn’t know about it.)
Anyway, I hope that you sort out your troubles and that you don’t get discouraged, I’ve had bad drivers, burned led’s, bad switches, faulty connections, and crappy solder joints too. Ultimately, there’s nothing like these lights when they work properly, and I firmly believe that it’s worth the hassle when you get to enjoy them.