Get LineageOS for the LG L90
Special boot modes
Recovery: With the device powered off, hold Volume Down + Power. When the LG logo appears release the buttons and then hold them again. Choose ‘Yes’ twice to confirm.Note: Accept the factory reset prompt using the hardware buttons. If you have done everything correctly, this will not actually reset your device but instead will boot the custom recovery.
Bootloader/Fastboot/Download: With the device powered off, hold Volume Up and connect the USB cable.