I've crafted a Wifi and unlock package
(yes, SDIO wifi cards work 100% on it
) for the Mio C230
(NOT the C320
). It currently works with a Spectec SDW 821 Wifi card
(it should work with the SDW 820 too, but I've not tested it enough yet.
Anyway, here you go
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http://www.mediafire.com/download/cg29vbg5d7igz1e/mio_c230_wifi_unlock_v2.1.zip