Hey everyone dark souls 1 is now back compat on the Xbox one. First you need to install the Xbox one update.
Go settings>system console info and updates. Update is around 5GB.
Once done pop in your dark souls 1 disc or download/buy it from the Xbox one store.
Enjoy.
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I did that a few days ago. I died more than I expected probably due to DS2: SOTFS's higher frames making it harder to play lower frame games.