Team Win Recovery Project (TWRP) is a custom recovery image that enables users to flash third-party ROM and apps with ease.
TWRP has released the latest version of TWRP recovery image for Xiaomi Redmi 3S and Redmi 4A. The announcement comes in the official blog of TWRP.
How to install TWRP on Redmi 3S and Redmi 4A:
To install TWRP recovery you need to unlock the bootloader of your device. Click here to see the unlocking guide.
After unlocking the bootloader, go to Play Store and install the official TWRP app.
After installing open it and select TWRP Flash. Select your device from the device list (land) and choose a version.
The file will download to your Downloads folder. Browse to and select the file. Then Tap on Flash to Recovery.