So after a lot of digging and help from this thread http://avic411.com/index.php?/topic/83064-sph-da120-radio-frequency-odd-to-even-solution/ (thanks hilux).
I successfully converted my stereo from US to EU by updating to a EU uCom version. Its an internal firmware different from the one pioneer provides openly.
You can find all the files you need on 4pda.ru (need to register in order to download).
If someone wants i can upload a guide.