Updating xbox firmware
The Xbox One allows users to download applications that add to the functionality of the dashboard.
From June 2014 onwards, entertainment apps no longer required the user to be signed into a valid Xbox Live Gold account in order to use the features advertised for the given app.
UPDATE: Microsoft has removed its instructions for updating Xbox One without connecting it to the internet.
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I followed the instructions, so I didn't know why I got an "unreadable disc" error.
After a lot of searching Google for a solution, I found one.
I don't know if my Xbox 360 already supports backward compatibility (in the Xbox 360's case, the ability to play original Xbox games) for it, so I decided to update it.
I don't have Xbox Live (which you would usually use), so I decided to update it by downloading the update from and putting it on a CD, and then putting that CD in my Xbox 360.