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I never went through the update when I still had a KDXG. So take my advice with a grain of salt. Looking at the code of launchpad, it recognizes a K3 at runtime. So it will probably chose the right key codes for you device in any case. During installation, it will add a script to /etc/rc*.d that cares for launchpad startup/shutdown. I'm just guessing here, but I think even in that case, both installers (K3/KDXG) at least should not do harm. However, because of the device serial number is left unchanged, only the KDXG update will install, I think. I'd try that - but will not give any guarantees.
As for which jailbreak is needed or works, I cannot give clues, sorry.
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