Mountain Lion recovery method

Hi all.
Macbook Air late 2010, ssd 64gb.
I had to re-install the system, but i had some difficulties.
I started up first with ALT and i tried to format the disk before recovery, but the disk utility was not able to unmount the disk for formatting. So I prepared a usb key with 10.8 in.
Started up with that, formatted the disk, recovery.
Afetr the percentage bar going over 50% I get the message "NOT ABLE TO DOWNLOAD ALL DATA FOR OSX INSTALLATION" something like that but in Italian.
Tried with the ML DVD too, but same.
I'm connected to an open wi-fi, and try with an ethernet adapter, always the same message.
help me, please.
Thank you

There's an EFI update that allows your late2010 MBA to use Internet Recovery, however it sounds like that hasn't been applied to your sytsem, so you don't have that available to you.

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