FLYME OS 6 REDMI 4X|stock rom go to rompure.com

you need to have unlocked bootloader and TWRP

1 - Enter TWRP VOL+ /POWER -Choose Wipe option
2 - Choose Advanced Wipe
3 - Select Cache, Dalvik Cache and Date
    DONT SELECT SYSTEM!! - Return to the main menu
4 - Install the ROM through the Install option;
5 - In the end choose the option Wipe Cache / Dalvik;
6 - Reboot (wait a few minutes to finish the installation)

download rom and put on your SD CARD:https://cloud.mail.ru/public/7SMr/DDASiAQiU/flyme_Redmi-4X_YiRan_6.7.7.7R.zip

thanks to J108i93E

see all the video,HD with few tips that you need:

https://www.youtube.com/watch?v=ap9fDWRWViQ