It has been strongly advised the customers do not perform the modular changes I believe.
This is the exact copy on every upgrade product page:
Other Installation Options
If you’re an experienced electronics technician or engineer who is familiar with ESD precautions, or work with a good tech, you can choose to have the Bifrost 4490 board sent to you directly, fully tested and protected in an antistatic bag.
Please note that by selecting this option, you are saying, "Yes, I am, or know, a competent electronics technician who does not need hand-holding for this installation, and I will not allow an inexperienced person to perform the upgrade, since I understand there are no user-serviceable parts inside."
As I've mentioned before, any dismissal of the "no user serviceable parts inside" disclaimer (printed on the product chassis) means we have just ensured the lifespan of the company is finite.
It's like this:
1. A guy gets the idea that it'd be kool to swap the fuse for one of those shiny gold-plated nanocrystal doodads that cost a bunch of money.
2. He opens up the product...while it is still plugged in...while he is in the bathtub.
3. His next of kin contacts us and lawyers happen.
4. Lawyers do a forensic audit of everything we've told every customer (including emails, forum posts, etc).
5. If we ever implied that it was cool to open up the chassis in any way at any time, all support for your Schiit products cease because the company no longer exists.
So, yes, there are "no user serviceable parts inside," and that is why any upgrade cards are intended to be installed by authorized electronic service personnel only. That will include these cards, when we get around to listing them on the site. (For now, let us walk rather than run, please.)
That doesn't mean that someone won't (a) figure out how to swap the cards, and (b) put a guide up online. But that's not us.