If you are going to exchange your Mogul through Sprint, you should not be upgrading it to an unofficial ROM; they will likely tell you that any problems you are experiencing were due to the ROM and refuse to exchange it.
Since "the directions for the GPS patch" could be many things, can you list what steps you took and what error messages you got? Which ROM were you trying to flash and how far did you get?
Which Sprint ROM update did you try that gave you error 328?
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