Xiaomi on Tuesday announced that it has made available MIUI 7  global stable builds for a range of devices. The new version of  Xiaomi's mobile OS is available for download from the company's official  forum, and is also being rolled out in the form of an OTA update.
Stable MIUI 7 builds are available for the 
Xiaomi Mi 3, the 
Xiaomi Mi 4, the 
Xiaomi Mi Note, the 
Xiaomi Redmi 1S, the 
Xiaomi Redmi 2, 
Xiaomi Redmi 2 Prime, the 
Xiaomi Redmi Note, and the Xiaomi Mi Pad. There's no word on when the Xiaomi Mi 4i will receive the update.
Based on Android Lollipop,  MIUI 7 comes with a number of features such as four built-in themes, a  daily lock screen that changes its wallpaper everyday, and a new mode  that gives a user the option to lock down apps they don't want their  kids to access.
As for improvements, the company claims that MIUI 7 offers up to 30  percent better response time than MIUI 6. Users should also find it  light on battery as some tweaks on how the operating system handles the  background apps have been introduced.
 If you've never flashed your device - manually installed the ROM on  your handset - you should wait for the OTA update to arrive for your  phone. Users can check the 
Updater app on their MIUI  device to see if the OTA update has arrived for them. If it has, users  should press Update, and then press Reboot now once the download  completes to finish the installation.
Alternatively, you can follow the instructions below to install the latest flavour of Xiaomi's take on Android for your handset.
What you need to know before updating the device is that there are  two builds available for your device: Fastboot, and Recovery. Updating  your handset using the recovery build is easier, and furthermore, it  doesn't wipe your existing files and settings. Fastboot requires you to  download the Mi PC suite on your computer, and using this method wipes  the files and settings on your device. 
Users running stable MIUI 5 or MIUI 6 stable builds are recommended  to wait for the OTA update, or flash the full ROMs in recovery or using  Mi PC suite. If users are running the MIUI 7 China developer build, or  the MIUI 7 global beta build, they are recommended to flash the full ROMs after wiping all user data, as they will not receive the update over-the-air.
If you wish to wipe all your settings - preferable only if your  device has some issues - you can follow the instructions mentioned below  recovery mode.
Below we've explained how you can update to MIUI 7 using the Recovery ROM, Mi PC Suite, and Fastboot ROM.
How to update using Recovery mode:1)  Take a  backup of all your data. Save all your photos, contacts, downloaded  files to your computer or save it to any of your favoured cloud storage  service such as Dropbox, OneDrive, Google Drive.
2) Download the MIUI 7 build corresponding to your smartphone.
3) Rename the 
Recovery ROM you downloaded to 
update.zip on your computer.
4) Connect your smartphone to the laptop using a data cable, and copy  the ROM file downloaded into the root directory of the internal storage  of your device. Ensure that you haven't placed the file in any other  folder.
5) Now you have to enter the recovery mode to initiate the  installation process. There are two ways to put your phone in the  recovery mode:
- Method 1: Launch Updater app on your device, click the ... icon at the top-right corner, and select Reboot to Recovery mode to enter.
- Method 2: You can also turn off your device and then hold both Volume + button and Power button at the same time to enter Recovery mode.
6) Once in Recovery mode, you can use 
Volume +/- to select up/down, and 
Power button to confirm.
 7) After entering 
Recovery mode, choose your preferred 
language, and select 
Install update.zip to System One and confirm. Doing this will initiate MIUI 7 installation to your device. Wait until the update is completed, choose 
Reboot to System One, and then your device should boot to the MIUI 7 version.
How to update using Mi PC SuiteThis method is only meant for users running stable bulds of MIUI 5 or MIUI 6.
1) First, download 
Mi PC Suite and install it on your computer.
2) Turn off your device, press the Power button and Volume down button at the same time to enter Fastboot mode.
3) Connect your device with the computer with a USB cable.
4) Open 
Mi PC Suite and let it find your device. Then select 
Update. If the update is available, click 
Update now.
How to update using Fastboot mode:Installing a Fastboot ROM is a little bit more complicated, and you can follow the instructions below.
1) Download the MIUI ROM Flashing Tool from the 
Xiaomi website.
2) Download the Fastboot ROM for your device from the links below.
3) Switch off your Xiaomi smartphone. Hit the Volume- key and the  power button at the same time to enter Fastboot mode. Now plug in your  device to a Windows PC or laptop via the Micro-USB cable.
4) Double-click on the Fastboot ROM file you downloaded to your PC in  step 2 to decompress it.  
Open the folder where this decompressed ROM is  saved and copy the folder path.
5) Now decompress the flashing tool you downloaded in step 1. Then double-click on it to install it.
 After this, open 
MiFlash.exe and in its address bar, paste the folder path copied in the previous step.
  Now click the 
Refresh button and MiFlash will recognise your device.
6) There are three options you can choose from at the bottom: Flash  all will flash all the files, and wipe all userdata and all files in  internal storage. Flash all except storage will flash updated files,  wipe user data, but will not delete files in internal storage. Flash all  except data and storage will only flash the updated files, and will not  wipe user data and files in internal storage. To preserve your user  data make sure you select Flash all except data and storage.
 7) After this, click Flash button towards top right to flash the ROM to your Xiaomi smartphone.
8) Wait till the progress bar fills up. You will then see a message  next to it that reads: "The operation completed successfully". Your  device will automatically reboot and have MIUI 7 installed.