Hard reset Asus Zenfone 4 Pro ZS551KL

OS: Android 7.1.1 (Nougat), upgradable to Android 8 (Oreo); ZenUI 4

CPU: Octa-core (4x2.45 GHz Kryo & 4x1.9 GHz Kryo)

Display: 5.5" inc

Camera: 12 MP, Dual

For Hard reset Asus Zenfone 4 Pro ZS551KL use following steps

1. Press the Power button and turn off your smartphone

2. Press and hold the Volume Up and Power buttons for a few seconds

3. When the Boot Mode menu appears on the phone screen, you can release the keys

4. In the menu, go to Recovery. The Volume up key can be used to navigate and the Volume Down key to confirm the selection

Android logo Asus Zenfone 4 Pro ZS551KL

5. Wait for the Android Robot image to appear on the screen and press the Volume Up and Power keys

6. Go to "wipe data / factory reset", the Volume Up / Down keys are used to navigate the menu, and the Power key to confirm the selection

7. In the menu, go to the line "yes" and press the Power button

8. In the menu, go to "reboot system now"

9. Hard Reset procedure complete

Thomas Nilan
Smartphone Expert

Thomas Nilan is a mobile phone expert with in-depth knowledge of the Android and iOS operating systems, who understands the settings of various hidden features that allow you to expand the capabilities of your smartphone, as well as get information about what is going on inside the phone for future repairs. He is an authority in his field, which has allowed him to become a ghostwriter for several technology publications, and he enjoys writing small mobile applications for testing smartphones.