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i can only answer for the 4.1 upgrade : it will be a regular OTA, not like the jump from 3.3 -> 4.0
I don't think it should bother your dual boot, but you'd better get the confirmation from Matt
@ironic a friend of mine made an awesome ahk program to move all needed files to launch .uae whdolad files.
http://arcadespain.info/Foro/index.php?topic=5112.0
Non c'è molto supporto per gli utenti italiani purtroppo , sono tutte domande che mi sono fatto anche io ma senza risposta ....