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• I have tested this TWRP on my k4 note for about 5 times and found this TWRP to be free from all the problems.
• You have to perform this action of installing TWRP on your own risk. Sometimes, user gets stuck in boot loop.
• Make sure your Model Number is A7010a48. It does not work for a 2GB variant of Lenovo k4 note.
• The Fingerprint scanner will stop working if you are running an android version of a lollipop 5.0.1 or below. The sensor is not stopped permanently, if you upgrade your android to marshmallow or nougat then sensor starts working again.

• You must unlock the bootloader on Lenovo Vibe k4 Note.
• Download the Recovery image-Click here to download recovery
• Download the Kingroot app from its official website.
• Download the RashR app from play store.

1. The first step is to root your k4 note. There are many methods to root k4 note, let us go with the easiest procedure. If your phone is running on android lollipop then download kingroot application. 
2. Kingroot is an apk file which is not available on play store. Before installing the kingroot app, go to settings and then go to security and enable the unknown sources.
3. Install the app and then click on try root on your display. Your phone may reboot once during the process.
4. After rooting process is completed, you will receive a confirmation message on the screen.
5. You can check if your device is rooted or not by just downloading an app called Root Checker from Play Store and click on verify root. If you have followed the above procedure properly then you receive a confirmation in root checker app saying "Device is successfully rooted".
6. Download and save your recovery image file to your SD card.
7. Open the RashR app and select install "Recovery from storage" and select recovery image that you have saved in SD card.
8. When prompted on screen, tap on Reboot.
9. Your phone will boot into recovery mode which in this case is TWRP.
10. Enjoy TWRP recovery on Lenovo Vibe K4 note!

1. Install Custom Recovery: The very First thing to do after root is to go ahead and install a custom recovery. You may what is a custom recovery? A custom recovery is a customized and more advanced version of your phone recovery. Once you install custom recovery you can do a lot more things on your android devices. It allows to install zip files, it allows you to flash custom ROMs on your phone, it allows to wipe, manage or even format your phones cache and partition and with the help of custom recovery you can even back up the entire android system. So if you do not have a custom recovery then go ahead and install a custom recovery. Some of the best recoveries are TWRP and CWM recovery.
2. Install Custom ROM: Next thing to do on your rooted android device is to install custom ROM. This is the main reason why 50% of android users root their smartphone. Basically, Custom ROMs are customized, more advanced and more featured version of android. Stock ROM is taken and modified and more features are added and useless features are removed, bloatware features are removed in a custom room. In short custom ROM is pimped version of the android operating system.
   
3. Delete Bloatware: Bloatware are the apps that come pre-installed on your android devices which are not even used but keep on running in the background and these apps always keep eating the battery. Download any bloatware removing the app from the play store. After removing the bloatware, you will see significant changes in the phone i.e., increase in battery life, performance and it will also free up the internal storage.
   
4. Install Root apps: Some of the apps will work if and only if you have root access and these apps help to customize your smartphone to a different level. You can download screen recorder apps and you can download tons of different apps. These apps can be found in play store and usually say "Root Users Only".
5. Customization And Tweaks: Your device has thousands of customization options and tweaks. If you want to tweak your android then goes ahead and install ROM toolkit app from the play store and it is for free. You can change the font size and you can also change the way how it behaves. You can change how your icon looks. You can increase the Wi-Fi range. You can increase the battery and so on. The sky is the limit for tweaking the rooted android. You can change the look, the behavior , the animation of your android device.

• Backup the data in advance because this process will delete all the data from your device.
• Unlock k4 notes bootloader as it allows you to flash the flashable zip files.
• Flash the custom recovery TWRP on the k4 note because this recovery is responsible for installing android nougat on your k4 note.
• A windows PC or laptop. This method does not work on mac OS. 

• Lineage OS ROM based on Android N 7.1.1
• G Apps(Arm 64 7.1)

1. Download the zip files of ROM and G Apps from above and save them to your memory card.
2. Switch off k4 note and press volume up key, volume down key and the power key at the same time for about 10-15 seconds. This will take your android phone into TWRP recovery mode.
   
   
   
3. Tap on backup and swipe to backup the data. If you do not like the ROM or if anything goes wrong, you can recover it back through this. 
4. Tap on the wipe and then click on the advanced wipe, now select Dalvik, Data, Internal Storage, and Cache. Swipe at the bottom to wipe. This will clean the memory of your k4 note.
5. Go back and tap on install and select the first zip file of Lineage OS ROM, swipe at the bottom to flash. 
6. After the installation is finished, go back and select the second downloaded zip file of G-Apps and swipe at the bottom to flash. The flashing will take around ten minutes. This G apps zip file contain all the google application which includes google chrome, play store, hangouts and so on. 
7. Click on reboot system and your k4 note will be booted into lineage OS. The first boot may take longer so do not disturb it. 
   

                                

Disclaimer: I have tested this method of unlocking the bootloader with Xiaomi Redmi Note 3, Redmi 3s and Mi 4i and succeeded in it. I hope this method will work with other Xiaomi Devices as well. You should perform the task at your own risk as unlocking the bootloader voids the warranty. I am not liable for any damage.

1. On your phone, open settings << Additional Settings << Privacy << Device Administration << Android Device Manager and enable it.  
2. Go to MIUI Unlock Page and sign in with your MI Account.
3. Provide your details and apply for permissions
4. You will receive an SMS within 5 days for unlocking the bootloader.
   
   
   
5. After receiving the reply, dont do anything for next 5 days and wait for another 5 days.
6. Extract the downloaded MI Unlock Tool.
7. Open MI Unlock Tool and log in with the same MI Account that you used for sending the permissions.
8. Power off your phone and press volume down key and power button at the same time for 10 seconds and your device will boot into the fast boot mode.
9. Connect your phone in fast boot mode to the computer.
10. Click on unlock on the MI tool and the percentage goes from 0 to 100.
11. Soon your will receive a message on screen saying "Congratulations Unlocked Successfully".

• Flash the Custom Recovery.
• Flash the Custom Rom.
• Flash SuperSu and Root your device.
• Install Xposed Modules based MIUI version.
• Enable the Virtual Keys on screen.

Xiaomi Redmi Note 4 Pricing & Variants:

Xiaomi Redmi Note 4 Specifications:

• Redmi Note 4 is powered by snapdragon 625 chipset(Octa Core).
  
  
• 5.5 1080p IPS Lcd Screen.
• Adreno 506 GPU.
• 32/64GB Internal Storage.
• Dual Sim with Micro SD Slot. 
• 13MP f2.0 aperture Rear Camera/5MP Front.
• 4100 mAH Battery.
• IR blaster.
• Fingerprint Scanner.

Other Sensors: Accelerometer, Gyroscope, Ambient Light sensor, Proximity Sensor and Electronic Compass.

Design & Build:

As Redmi Note 3, Redmi Note 4 has metallic build all around.The Build Quality is Top Notch. It comes with strong 2.5D curved glass which comes with good protection.Even it falls from a height of 2meters, it wont break easily.  It has better viewing angles than Redmi note 3. To the back of Redmi Note 4, we have a 13MP f2.0 aperture camera with a wide angle of 77 degrees, below which is dual tone, dual Led flash and at the bottom is MI Branding. To the front, is a 5MP front facing the camera with a wide angle of 85degrees below which is a 5.5" IPS Lcd Screen. At the bottom, we have backlit navigation keys. 

The Dual Sim(Hybrid) Redmi Note 4 supports 4G with VOLTE.  It comes with MIUI 8 on top of Android Marshmallow 6.0 and it will receive Nougat update by June 2017. Redmi Note 3 always produces overexposed pictures.The camera sensor in Redmi Note 4 is improved now, you get fast focusing and excellent pictures with this device. As the camera sensor is provided with dual tone, dual led flash, the low light performance of this camera is excellent.

Tips for buying Redmi Note 4

How to get one for you?