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nk.nbf is the Operating System for your device. It is carrier independent--you can install it on any Apache. You just want to make sure you are not flashing any ms_.nbf or radio.nbf files as those are unique to the carrier. If you just have the nk.nbf file in there your existing extrom (which has your alltel-specific files on it) and your radio rom (also carrier specific) will not be touched so that's the way to go.
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