By the way ... next step will be switching form
headunit -> DSP -> amp
to
phablet/tablet -> DSP by bluetooth -> amp
iPad mini would be great but to not fit right, plus I cannot use torque. Something like a LG G Pad 8.3 would be great, but no chance to sync my iTunes perfect

Also the display is not want I expect. Rooting could be an idea, but my last two tries end up in softbricks