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There may be a way to update the date built into the ROM.
But PRL? That can't really be feasibly put in the ROM because the PRL is stored in the nonvolatile memory of the CDMA chip inside your phone. The ROM is totally different. Now the ppst.exe and PRL file could be put into the ROM so that it would insert the PRL onto your device when run but we would have to account for every carrier. Too much hassle.
It may be possible to do as an OEM package, but it's best off being manually installed for people who know what they're doing, or installed as a cab for people who don't.
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