Good news for those looking to root their Fire TV 2. Software version 5.0.5, which is currently arriving on devices, does not block rooting. AFTVnews reader Nano Parodi has chimed in to confirm that he successfully used my new rooting guide to root his Fire TV 2 that already updated to version 5.0.5. This means that all 2nd-gen Fire TVs, regardless of the software version they have, are rootable.
If you have a Fire TV 2 that has updated to 5.0.5 that you want to root, you should block updates since the next software update may block rooting. Then, you can either follow my rooting guide and downgrade to the 5.0.4 pre-rooted ROM, or wait for rbox to release a pre-rooted version of 5.0.5 and then follow the guide.