LG P760 USB disconnecting and reconnecting by itself - LG Optimus L9 P760, P765, P768, P769

Hi,
i have a DEAD LG P760. When i connect to pc LG P760 disconnecting and reconnecting by itself in LOOP
The problem is with or without battery.
Thanks
Andrea

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I open a new post because I have not found solutions.
I attached and detached the USB cable and the battery several times to try to get into the S / W Upgrade mode.
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Thanks and sorry for my bad English.

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