I have tried all the ways I have found online to get to recovery mode so I can clear the cache after the last update, and I can't make it happen. Has anyone found the right way to do that on an ATT G4? Tried holding power and vol down, phone booted normally. Tried doing that and briefly releasing the buttons when the LG logo displayed. Tried just releasing the power button briefly. The phone just booted normally. How do I do this???