Following is the method to tell you how to enter into LG Quantum C900 Emergency Download Mode, this mode will help you to connect your LG Quantum C900 to your computer and use flashing tools (e.g. LGDMP) to restore or change your firmware. I am pretty sure it can get your phone working again if it is bricked. Good luck. LG Phone Problem and Solution
How to enter into LG Quantum C900 Emergency Download Mode Steps:
Caution: Remember to backup your files before flashing. This will erase all of your personal data. LG Windows Phone 7
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this not work, the correct is: open the keyboard, hold space and press power.