You can find the writeup of how I downgraded the firmware here: https://grell.dev/blog/di2_downgrade

The actual attack is described here: https://grell.dev/blog/di2_attack

I don't have one published yet, but I plan to publish it on my blog soon. It might be after this thread gets locked. Feel free to send me an email so I can notify you about it when I publish it. My address is my username @posteo.de