Android N 7.0(Nougat) For Mi 3/M i4

REQUIREMENTS :

• Download fastboot drivers for Mi3/Mi4 : Click Here
• Download Platform Tools : Click Here
• Download TWRP recovery for Mi3 : Click Here
• Download AOSP Android Naugat for Mi3 : Click Here

How To Flash TWRP Recovery on Mi3 :

• Download fastboot drivers for Mi3/Mi4 and Install 
• Download platform tools Extract platform tools to wherever you want(e.g.F:\Temper\platform-tools\recovery.img)

• And at the same time, press Shift + Right click to open and click Open command window here.

• Type "adb devices" to see if you're device is detected.
• Now turn off your device and turn on fastboot mode(by pressing volume down+Power button) and connect to PC
• Now to check if you're device is still there, type "fastboot devices".

• Now download twrp recovery for Mi3 from above and paste it to platform-tools (mine is located @ F:\Temper\platform-tools\recovery.img)
• Type "fastboot flash recovery recovery.img". Notice that the recovery.img corresponds the filename extracted earlier

• Now type "fastboot reboot" to reboot the device.
• You have successfully flashed twrp recovery.

How To Install Android N(Nougat) On Xiaomi Mi 3/4 :

• Download Android N rom from above.
• Paste it to your device's internal storage.
• Now open twrp recovery mode for that you have to connect your device in fastboot mode and then command window from Platform tool and enter the command "fastboot boot recovery.img"
• Now you have entered into twrp recovery
• Then go to "wipe" and wipe Dalvik cache, Cache, Daga and System.

                         

• And then go to "Install" and select the android N zip file

                     

• Everything is done