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Root Reboot screen in loop

You haven't said whether you can boot into recovery mode. As someone who has just experienced a very similar problem, you need to boot into recovery mode: hold down the phone/send key, the menu key, and the power key. After about 8 seconds, release the power key. You should see the LG logo. After a few more seconds, you'll see the Velocity screen. Release the other two keys. You should now be in recovery mode.
 
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