LG G4 Quick Start Manual page 4

Ex) fastboot erase boot
iii. reboot : fastboot reboot OR fastboot reboot-bootloader
2. Exit fastboot mode and reboot.
i. Press the Power button for 10 seconds to turn off the device.
ii. Use 'fastboot reboot' command if the fastboot prompt is available.
Please refer to the FAQ for additional questions and answers on unlocking the bootloader.
http://developer.lge.com/resource/mobile/RetrieveBootloader.dev
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