Remove Sim tray

Using a knife start prying at the back in the top right corner. Then use a metal spudger to remove the back piece.

Remove two screws.

in my case one of the screws was covered by a small white sticker

using a metal spudger I started separating the two halves of the phone shell on the right of the USB port.

by carefully inserting and twisting the spudger I could unclip the two halves to separate them

be careful not to insert the spudger too deep, you could damage the mainboard or battery

as I wasn't careful enough, the frame broke in two places

now remove the back half

I looks like the back contains some antennas and a speaker

now remove the spongy piece that sits ontop of the USB port

at this stage I noticed a screw falling on my table and the screw to the right of the USB port was missing

I also noticed the screw to the left being loose

Now remove eight screws and the power button

I unplugged the two antenna cables

unplug the battery connector

now I opened the clips that hold the ribbon cables

at this point the device felt loose and I didn't know how to continue - I noticed after beginning to pull on the battery pull tabs that the mainboard separated

by gently moving the mainboard down (direction of USB port) the mainboard could be separated

notice the metal hook that prevents the device from being separated without downwards movement

remove the middle screw

Now I could remove the screen and main board