Turn off the phone, then hold Power + Volume Down (or use a "Reboot to Recovery" app).
By updating your LG Optimus Black, you can transition from a sluggish legacy device to a streamlined, functional smartphone capable of handling modern lightweight apps. firmware+change+update+on+lg+p970+optimus+black
Click Start . Do not disconnect the cable until the phone reboots. 3. Changing Firmware to Custom ROMs (The Power User Way) Turn off the phone, then hold Power +
90% of flashing failures are caused by improper USB driver installation. Always use a rear USB port on a desktop PC for a stable connection. Turn off the phone