Instruction:
1. Go to TWRP
2. Wipe > Advance Wipe > Dalvik / ART Cache & System & Cache & Data (For fresh Install, ignore if updating from any previous MIUI rom to keep ur data)
3. Install Zip package
4. Clear Dalvik Cache (If updating from any previous MIUI rom)
5. After start keep airplane mode on by presing power key & salect aeroplane mode on ( this need to be done only while startup wizard, after complete start wizard you can off aeroplane mode)
6. Enable "Documents" app by going Setting > Install apps > go to end of apps there is "Documents" app & enable it.
For NVRAM Error:
Download NVRAM File & replace the both file Wifi & Wifi custom to Root or (/Device) > data > nvram > APCFG > APRDEB
& reboot.
IF FACING APP SLEEP IN BACKGROUND OR NOT AUTOSTART THEN PLEASE FOLLOW BWLOW INSTRUCTION.
1. Go to Security app > Permissions > Autostart > Enable the perticular app which you want to be autostart.
2. Go to Security app > Battery > App battery saver > (click on pertucular app which u don't him to be sleep & keep running in background) > choose "No restrictions"
Changelog in 6.7.14
New – Deleted button in the screenshot mode
Very smooth then 6.7.12
Lockscreen, Status Bar, Notification Bar
Optimization – Clickable arrow for Wi-Fi (07-12)
Optimization – A prompt about entering password and activating fingerprint after rebooting the device (07-13)
Fix – Customized carrier name isn't shown in Second space (07-12)
Home screen
Optimization – Landscape mode for Task manager (07-08)
Optimization – Task Manager stability (07-13)
Fix – Issues with wallpaper when switching to Second space (07-13)
Delete – Home screen Music widget (07-13)
Gallery
New – Delete directly from the screenshot preview page (07-12)
Optimization – Adjusted size for the button which creates new albums (07-12)
Optimization – "Show original" option appears only on cloud or optimized items (07-12)
Optimization – Double tap to zoom in, swipe up without entering sharing mode (07-12)
Optimization – When auto-rotate is off in Gallery, it won't influence the rest of the system (07-13)
Fix – Scrolling screenshot issues in Notes and Mail (07-12)
Fix – Couldn't go back to the original photo after making a screenshot or finishing editing/sharing it (07-12)
Fix – Couldn't pick up calls while making Scrolling screenshots (07-13)
Fix – Enter system app while editing a scrolling screenshot in the OOB flow (07-13)
Delete – Removed Edit option for GIF images (07-12)
Weather
Fix – Issues with curves in forecasts (07-13)