One question: Here is my situation: My device is international version which is unlocked and S-On with HBoot 1.57. I am using MaximusHD 52 Lollipop. If I want to upgrade my firmware to 7.19.401.2, what should I do? I already download this pure stock and copy to the devide, do I have to flash it via TWRP then have the firmware upgraded? Or I have to come back to KK stock ROM and get official update OTA?