After quite some tinkering and many unsuccessful attempts, I created a method for loading firmware through ASC and (more important), enabling SWD when the only J-Link available doesn't support SPD (J-Link EDU Mini).
It's basically a python script that loads a .bin firmware through a cheap serial adapter using ASC protocol. It allows us to send a firmware that sets the BMI register to SWD debugging mode, making it possible to debug and flash with our J-Link EDU Mini.
Everything is on this repository: equipepucpr/xmc_loader: Infineon ASC BSL Script (github.com)
