DISCLAIMER: I am not responsible for any damages this may cause as I am merely translating the guide, I am not responsible for you bricking your device because of a missed step so read carefully,
Also, Please backup your data beforehand as this does wipe the phone.
1-LGUP 184.108.40.206 .
2-LG Mobile Driver 4.4.2
3- LG FIRMWARE V600EA20c_00_0526.kdz
!!BE CAREFUL TO DO EXACTLY AS THE INSTRUCTIONS SAY OR YOU WILL BRICK THE PHONE!!!
1. Make a backup .
2.put youR lg v60 demo into Download Mode".
1. Open LGUP.
2. Pick V600EA20c_00_0526.kdz .
3. Select "PARTITION DL".
4. Press Start. And a pop-up window will appear. In this window you can select which partitions to be flashed
5. uncheck these partitions: XBL_A , XBL_B,XBL_CONFIG_A,XBL_CONFIGE_B ,SID_A and SID_B.
after completing the process it will boot up in some minutes .