[Elti90]

Hello all,
i recently bought a hyundai i30/2012. The problem is that, the car is bought in Korea and the head unit is in korean language. I tried to upgrade to newest version of sw, but the head unit doesn't recongised the usb.(i followed all the instructions from the official page of Hyundai), but still it doesn't work.
Can someone explain or help me? I need to change physically the head unit or there is another way? thank you