Make sure you have installed a custom recovery before

• Switch the phone off
• Hold the 'Volume Down' + 'Power' buttons
• As soon as the LG logo appears, release the two buttons and press/hold them again
• In the 'Factory hard reset' screen press the 'Power' button twice to actually enter the installed recovery system

./platform-tools/adb root
./platform-tools/adb push /tmp/cm-13.0-20160530-NIGHTLY-d802-recovery.img /data/
./platform-tools/adb shell
dd if=/data/cm-13.0-20160530-NIGHTLY-d802-recovery.img of=/dev/block/platform/msm_sdcc.1/by-name/recovery bs=1m
rm /data/cm-13.0-20160530-NIGHTLY-d802-recovery.img
exit
./platform-tools/adb reboot recovery

Check output of cat /proc/cmdline

• LCD_RENESAS_LGD = 0 (lcd_maker_id=0 mdss_mdp.panel=1:dsi:0:qcom,mdss_dsi_g2_lgd_cmd)
• LCD_RENESAS_JDI = 1 (lcd_maker_id=1 mdss_mdp.panel=1:dsi:0:qcom,mdss_dsi_g2_jdi_cmd)