LG GW550 hard reset1. Turn LG GW550 off.
2. Hold the Send + End Call key
3. While pressing Send + End press Power button located on top of the device. the device will begin to vibrate.
4. Release the power button and wait until the phone stops vibrating, then release the keys Send + End Key
5. Wait for the Hard Reset procedure to finish.
You can use LG Mobile Support tool to repair some LG cell phone model, after download select menu Customer Support > Recovery Phone
If you know LG GW550 hard reset with buttons / keys pls leave comment.