Hi Md. Mazharul Anoyar Miju Thank you for your asking. Kindly provide the information below so that we can better assist you. A. Does the issue appear right after any system/apps' download or update? Please try to enter "Safe Mode". If the function works well in Safe Mode yet the issue remains out of Safe Mode, please check any disturbance from installed 3rd party apps. # How to enter and exit "Safe Mode"
https://www.asus.com/support/FAQ/1005163/ B. Please try the following steps to access recovery mode for the Factory Reset: 0. Try to back up your data with USB cable. If you can not access the phone, please check if your google account or microSD card have auto backup your data. *Please note that once the steps are completed, all data, apps, settings and personal information will be deleted https://www.asus.com/support/FAQ/1036182/ 1. Power off the phone, then keep pressing "volume down key" 2. Press "power key" and stop press " power key" once you feel the vibration. Still keep pressing "volume down key". 3. Stop press "volume down key" once you enter [Android Recovery] Screen 4. Choose "Wipe data/factory reset">"Yes" 5. "Reboot system now" #Hardware Reset Guide https://www.asus.com/support/FAQ/1006346/
