After flashing the official stock firmware, you will gain your warranty back.

Smartphone’s can be bricked while trying to root it or flashing a custom rom or recovery.

You are going to need your device stock Rom for these following reasons someday. It’s always advisable that you backup your device Firmware after purchasing it. You can solve software errors by flashing Stock ROM.Operating System – Android 5.1 Lollipop (Funtouch OS 2.5).Sensors – Accelerometer, Proximity, Light Sensor, Compass.Battery – Removable Lithium-Ion 2,000 mAh battery.Display – Screen size 4.5 inches FWVGA (480 x 854 Pixels).Memory – RAM-1GB| ROM 16GB external memory support up to 128GB.Camera – 5 Megapixels Rear Camera With LED Flash | 2 Megapixel Front camera.Chipset -Qualcomm Snapdragon 410 MSM8916.For the phones with the 16:9 display screen:.How to Flash Vivo Y21L Stock Rom Firmware Flash File.