As Neil correctly states TouchFlo and HHC are nothing to do with GPRS, and to be honest I can't see how letting the extended rom install / not install making any difference as I stopped mine every time on the original rom and had no such problems.
It does seem to be that the rom is not loading correctly and may take a couple of hard resets to kick the drivers into life.

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Glofiish DX900, O2 Ignito (HTC Diamond), Glofiish V900, O2 Orbit 2 (Polaris), HTC Trinity, Advent 4213.
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