Schiit Yggdrasil GEN 5 USB Board Upgrade Instructions NOTES Do this at your own risk! You screw it up, not my problem. Not Schiit's problem. I have no idea if Schiit will allow a self install for the Gen USB board or not. Maybe they will on a selective basis. Again, I don't know. Gungnir should be very similar. The bottom, outer, inner chassis construction approach is the same. The biggest difference is that there is no separate PCB / ribbon cable for the front panel lights / source selector, so you will need to align the LEDs which is a pain. There is no easy way to do so, and I just didn't bother because I found the LEDs too bright and preferred them slightly inside the chassis. The one tip I would have is to put painters tape over the source select button and chassis. The button is free floating and will fall off when the outer chassis is removed. ELECTROSTATIC DISCHARGE PRECAUTIONS Take electrostatic discharge precautions. The advanced computering shit on the boards are sensitive to static discharge. Use a grounding strap. But in reality, no one is real life uses one, so ground yourself by touching the chassis of the Yggdrasil before you plug it. Don't do stupid shit like walk around and rub your socks on carpet. Handle boards by the edges. Leave the Gen 5 USB upgrade board in the anti-static bag until you actually need it. USE THE RIGHT TOOLS Have a good set of screwdrivers and use the right size bits. You do not want to strip the screws. Do not overtighten screws. This is very easy to do as the threads are soft aluminum or plastic. You will need a philips screwdriver and a adjustment wrench / plier (for the locknut on the BNC connector).