4490 is an excellent upgrade and a notable step up in sound quality. I did the board swap myself about 4 years ago. It was pretty simple. I might be wrong, but I think there was a video or photographic instructions somewhere online on how to do it. If not, it's still pretty straight forward. The trickiest bit is getting the LEDs to sit back in the holes in the case correctly. I'm still using Gen2 USB, but will upgrade once the Unison USB module is released.
Put it up for sale in the classifieds or pay it forward.
They're supposedly continuing to support Mk1 Bifrosts. I'm pretty sure Unison USB is going to be rolled out to most of their products. I think I read all that on one of their newer posts on their online book (https://www.head-fi.org/threads/schiit-happened-the-story-of-the-worlds-most-improbable-start-up.701900/). Edit: Found the quote
I upgraded my Bifrost Uber to the 4490 and it was a very notable improvement in all areas. It was an excellent upgrade that was definitely worth it. As far as the USB, I'm still on Gen 2, but am looking to upgrade to the "Unison USB" module once it's released (soon).
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