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hi,i have a few suggestions.First, you could try a non-US firmware version, as the US version has this DRM thing, and that could cause problems, but i dont know for sure.Second, make sure the filename is correct, especially the CASE i think it should be lower case h120.hex or h300.hex.And Third, try to flash the firmware two times, i heard from others that it only worked in the second try.
I'm afraid at this point it is an iriver problem, and I suspect it is them you shall have to ask.I think most people here will just say ask iriver.
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