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What do you need to get official tools for building firmwares and drivers for legacy Windows Mobile 6.5 platform? Like license/subscription or something.
There is some community software for rebuilding already made firmwares, but it doesn't work correctly.
Currently, Microsoft Q&A supports the products listed over here: supported topics (more to be added later on).
Your question about windows mobile 6.5 Firmware Development is not supported now. I suggest you might need to ask about this in other places.