If you want to use RFB 2.0,youll need SH4 version 1.5. You get that from uboat missions. and the only mod you need for RFB is RFB, and its patch. Though I highly recommend RSRD. Makes ship traffic much more realistic, and fixes/adds battles that actully occured.
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I used to be a huge submarine guy but now I'm a huge submarine girl ¯\_(ツ)_/¯
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