Along with the realease of the UK Fire TV, we saw the release of two new software versions: 51.1.40_user_514005520 and 184.108.40.206_user_514006420. So far only UK Fire TVs are getting these updates, but if the German Fire TV release is any indication, all Fire TVs should eventually be receiving these updates. Word is that the older of the two versions, 51.1.40_user_514005520, is incompatible with XBMC/Kodi. When launched on Fire TVs running software version 51.1.40_user_514005520, XBMC/Kodi is immediately crashing.
If you have a Fire TV running 51.1.40_user_514005520, it is suggested that you allow it to upgrade to 220.127.116.11_user_514006420 once the update is available to you. While it’s always best to stay on the oldest software version possible if you want to maximize your odds for compatibility with future rooting methods, it is unlikely that one of these two versions is more rootable than the other.
Everyone else outside the UK will likely be getting one or both of these updates in the coming weeks. Odds are your Fire TV will skip 18.104.22.168_user_514005520 and update to 22.214.171.124_user_514006420, but it’s best to keep an eye out for the update version to avoid losing XBMC/Kodi compatibility. When updating, if the Fire TV reports the updated version to be 514005520, it is best to cancel the update and wait for 514006420 or later. Of course, those running rbox’s pre-rooted ROM should just wait for a pre-rooted version of 126.96.36.199_user_514006420 to be released.
To clarify, Amazon has not blocked XBMC. There is just one older software version that causes issues with XBMC. Amazon has already released an update that fixes the issue and restores XBMC compatibility.