How to factory reset SAMSUNG Galaxy A21s? How to wipe all data in SAMSUNG Galaxy A21s? How to bypass screen lock in SAMSUNG Galaxy A21s? How to restore defaults in SAMSUNG Galaxy A21s? 
The following tutorial shows all method of master reset SAMSUNG Galaxy A21s. Check out how to accomplish hard reset by hardware keys and Android 10 settings. As a result your SAMSUNG Galaxy A21s will be as new and your Samsung Exynos 850 core will run faster.
1. At first push Volume Down + Power button for a couple of seconds.
2. Now hold down Volume Up + Power key together for a few seconds
3. Release all buttons if you see the SAMSUNG logo.
4. Use Volume keys to select wipe data/factory reset and confirm with the Power button.
5. Then choose yes from the menu and accept it with the Power key.
6. Finally use the Power button to select reboot system now.
7. Well done! Your device will be password-free.
Samsung Galaxy A21s Specification:
Samsung Galaxy A21s smartphone was launched on 15th May 2020. The phone comes with a 6.50-inch touchscreen display with a resolution of 720×1600 pixels. Samsung Galaxy A21s is powered by a 2GHz octa-core Samsung Exynos 850 processor. It comes with 4GB of RAM. The Samsung Galaxy A21s runs Android 10 and is powered by a 5000mAh non-removable battery. The Samsung Galaxy A21s supports proprietary fast charging.
As far as the cameras are concerned, the Samsung Galaxy A21s on the rear packs a 48-megapixel primary camera with an f/2.0 aperture; a second 8-megapixel camera with an f/2.0 aperture; a third 2-megapixel camera with an f/2.4 aperture and a fourth 2-megapixel camera with an f/2.4 aperture. It sports a 13-megapixel camera on the front for selfies, with an f/2.2 aperture.
The Samsung Galaxy A21s runs One UI based on Android 10 and packs 64GB of inbuilt storage that can be expanded via microSD card (up to 512GB) with a dedicated slot. The Samsung Galaxy A21s measures 163.60 x 75.30 x 8.90mm (height x width x thickness) and weighs 191.00 grams. It was launched in White, Black, and Blue colours.
Connectivity options on the Samsung Galaxy A21s include Wi-Fi, Bluetooth v5.00, and NFC. Sensors on the phone include fingerprint sensor.
As of 2nd September 2020, Samsung Galaxy A21s price in India starts at Rs. 14,999.