Check out the changelog below.
Support for exFAT SD cards
Separate App locks for Dual apps
Option for hiding the content of notifications on Lock screen
Separate App locks for Dual apps
Option for hiding the content of notifications on Lock screen
Verification SMS are shown on the Lock screen only after the Lock screen password is entered
Slide to browse wallpapers
Slide to browse wallpapers
Renaming albums
Custom groups for albums with people
Pausing ongoing backups
Renaming albums
Custom groups for albums with people
Pausing ongoing backups
Redesigned the Music app
Personal hotspot is now mutually recognizable by iOS devices
Separate updates for the system apps
Switches for common settings in search results
Personal hotspot is now mutually recognizable by iOS devices
Separate updates for the system apps
Switches for common settings in search results
Introducing Screen recorder
Introducing Screen recorder
Export birthday reminders from Contacts
Added official holidays for Indonesia, Malaysia, and Russia
Countdowns for exams, repayments, vacations, etc.
Anniversary reminders for important events
The update is about 1.3GB in size, a stable build to roll out for all the users soon. Redmi Note 4 features a 5.5-inch (1920 x 1080 pixels) Full HD Display with  2.5D curved glass powered by a 2.0 GHz Qualcomm  (MSM8953) Octa-Core processor with Adreno 506 GPU It comes with a 2GB/3GB/4GB RAM with 32GB/64GB of internal storage.
On Camera, Redmi Note 4 has13-megapixel rear camera with f/2.0 aperture, LED flash and phase detection autofocus and 5 MP front-facing camera. Connectivity options include 4G VoLTE, Wi-Fi 802.11 ac/b/g/n ( 2.4 / 5GHz), Bluetooth 4.0, GPS + GLONASS. packed with a 4100mAh Battery.
Xioami Redmi Note 4 comes in Gold, Dark Grey, and Matte Black color. Redmi Note 4 with 2GB RAM and 32GB storage is priced at Rs 9,999 , 3GB RAM + 32GB ROM Priced at 10,999 and Rs 12,999 for 4GB RAM and 64GB model.