Downgrade from miui v7 beta to miui v6 on redmi note 4g single sim

m on redmi note 4g single sim and got out of the box using miui 7 5.9.17|beta
My question :
1. Is it save to flashmiui_HMNoteLTEGlobal_V6.7.1.0.KHIMICH_58a2f0a 647_4.4 ?
2. Can someone direct me to download link miui v7 stable version for global ?
3. Which file should i flash for root n change custom recovery ?


Thanx in advance