I was reading other threads about this, and found this post that says this...
As previously said, I was accessing the board using the serial debug ports...
So I disconnected the jumpers from the debug port, flipped the DIP switches to boot from SD, and voylá, wireless detected!
Classic AliExpress giveth, and AliExpress taketh away xD
Hell knows how I'm gonna burn this to NAND and EMMC without serial, but hey, now at least I know that it's not an issue with the board itself or with the image =D