That popup is fairly clear: CM doesn't support FW 5.4.5.
And previous FW versions are subtly broken on your device (Kindlets won't run), so, yep, you won't be able to use CM, no matter what, until someone adds FW 5.4.5 support to CM (a process which happens to be a real PITA if at all possible, so don't get your hopes up).
Last edited by NiLuJe; 07-25-2014 at 11:12 PM.
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