I resolved the issue myself.
I didn’t know that is a must to use dd or rawrite to create the usb installation media.
I always used unetbootin for my “whatever” linux/unix installations and it just worked, I haven’t thought about it could be the issue. Reading the quickstart guide again I saw that dd is specifically mentioned. I gave it a try and it is working.
Perhaps someone can mention that specifically that no other tool to create the usb installation media is going to work properly.
thanks