I can't really answer the module question, as I don't really know enough about it yet, but I'll just explain the rest. 2.71 SE-C is basically SE-B" with module support - so you can go straight from 1.5 to 2.71 SE-C without going to any of the firmwares in between.

Think of it as like Windows - SE-A was Windows 2000, SE-B was XP, the updates in between are the service packs, and SE-C is Vista. Sorry if this bit confused you further - if it did, ignore it.

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