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Step 2 is important - this is what actually performs the coding in your car. FA_Write will update the stored FA, but in itself doesn't do anything to the configuration of the module, it's just a list of options your car has installed that can be used to code modules in future (e.g. if your FRM failed, you could read the FA from the CAS and use that to re-code your new FRM).
The difference between FRM and NFRM is that earlier cars had FRM1, called FRM in NCS expert. Later cars with FRM2 and FRM3 are called NFRM. Use whatever one your car has installed, in your case FRM, and ignore the other.
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