Xiaomi has released Android 7.0 Nougat update for Redmi Note 4/4X with MIUI 126.96.36.199 Global Stable ROM update. The incremental OTA (over the air) update starts rolling out which will reach across Redmi Note 4/4X in the coming days. If you cannot wait for the OTA update, you can download and install MIUI 188.8.131.52 Global Stable ROM manually on Redmi Note 4.
Nougat based MIUI 184.108.40.206 Global Stable ROM for Redmi Note 4/4x brings features like separate app lock for Dual apps, option to hide notification content on the lock screen, data and battery saving features, more customizable quick settings menu, general bug fixes and latest Android security patches (patch level July 2017).
If you have not received the Nougat update (MIUI 220.127.116.11 NCFMIED) notification on your Redmi Note 4, check it by going to Settings > About phone > system update.
Alternatively, you can manually install the MIUI 18.104.22.168 Global Stable ROM update on Redmi Note 4 by downloading the firmware.
How to install MIUI 22.214.171.124 Global Stable ROM manually on Redmi 4
1. Download MIUI 126.96.36.199 NCFMIED Global stable ROM recovery image from here and save it on your Redmi Note 4’s internal memory.
2. Launch the ‘Updater’ app on your phone, tap on 3 horizontal dots (…) at the top-right corner, select ‘Choose update package’ and then select the ROM file you have saved.
3. Your device will start updating and will reboot after finishing the update.
Enjoy Android 7.0 Nougat on your device. If you have any question, let us know it in the comment section below. (Source)