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1) I don't think there is a lower version for the KT2 (maybe a 5.5.x that was not at-large for very long).
2) Most likely it is, let us know if it isn't (the download is done by the current version firmware you are running (5.6.1.0.2) and I don't think anyone has tested that one - it wasn't around for long either).
3) You should be good to go, with any means to reach a username 'root' command line prompt - so glue it back together.
4) It 'fixes' the old style JB that got damaged by an OTA update.
4.1) No.
4.x) Just keep your JB current with the one in NiLuJe's snapshot thread.
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