The Chromecast is a pretty awesome media player that pays for itself. If you want to use it without the internet, though, you're fresh out of luck. This custom ROM can change that. XDA user rundgong has created a custom ROM that allows you to turn the Chromecast into a local media player, no internet required. While it's super rudimentary -- all playback controls are handled by the one small button on the Chromecast itself -- it can be handy in some rare situations. Say you want to use it in a hotel without setting up your own Wi-Fi hotspots. Or you can try it because it's just cool. Keep in mind that this will wipe your Chromecast, so don't use this on a device you also plan to use normally.