As my understanding of reading the info the last Miui Weekly is going to be on 16th of November, this release is the Penultimate http://en.miui.com/thread-1083718-1-1.html, so i ask are you going to release the ultimate on the 16th for this devices?
Maybe i can help but i need to acess by remote if you want
by teamviewer
https://download.teamviewer.com/download/TeamViewer_Setup_pt.exe
if you want send me a PM
If you installed android 7 latest developer rom, you need to unlock bootloader again and install twrp again just do what i mention before on above mensage
To install TWRP
Download latest recovery https://www.androidfilehost.com/?fid=673368273298930581
extract and put the recovery.img (rename if other name) on adb
Start Windows command prompt by pressing <Windows key> + X and then choosing "Command Prompt (Admin)". Once console (black box) opens...