The GTVHacker team that previously unlocked Google TV and Chromecast hasfound a way to run its commands as root on any Roku 2 or Roku 3 using the most recent software version (unfortunately, that does not at this time include Sky TV's cheap Now TV player, which runs on older software). While the player overall is credited as "considerably more secure than others in the entertainment field" (Samsung comes to mind but it's from from the only one) a development password field provided a way in.
Currently they've only achieved persistence on the Roku 2, which in this case means they can maintain control even after the box reboots by breaking the secure boot process and modifying the initial boot loader. Since Roku 2 runs on the same Broadcom chip used by the popular Raspberry Pi, team member CJ Heres expects to see ports for third-party home theater PC software like XBMC very quickly. The Roku 3 will be a bit trickier since it runs on different hardware, and right now it needs to have the command entered each time the box starts
http://www.engadget.com/2013/12/28/roku-2-roku-3-rooted/
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