1. First download Xperia Companion on a laptop or PC.
2. Take the program here www.support.sonymobile.com/global-en/tools/xperia-companion/.
3. Install this program to your computer.
4. Turn off the phone and connect the USB cable to the computer.
5. Open Xperia Companion and in the main menu, select Software Repair.
6. Confirm the process, follow the instructions on the screen.
7. Translate Sony Xperia XZ3 to FastBoot Mode.
8. Hold down the Volume Down(-) button Connect the USB cable to the phone.
9. Press the Next button to delete all data.
10. Upon completion, turn off the phone.
Hard Reset - advantages and disadvantages Sony Xperia XZ3?
In simple words, Hard Reset means hard resetting the phone. As a result, the system automatically returns to the factory settings and the system is completely cleared. Contacts, correspondence, application, files, search queries, passwords - all of this is deleted from the device's memory.
Benefits of Hard Reset:
The ability to get a completely clean phone from user settings and data. Remove viruses and malware that block applications on the device. Solving various problems that arose on the device after installing some applications and did not disappear after uninstalling them.
Disadvantages of Hard Reset:
All your data stored in the phone will be permanently deleted. The need to have an up-to-date backup. After returning to factory settings, some viruses may remain in the phone.
What needs to be done before the Hard Reset operation.
In order to use the phone after a hard reset and it is not blocked by the FRP, make sure that you know the login / password to your google account. You can sign out of your google account before resetting. In this case, after performing a factory reset, you can immediately use your device. If after a hard reset you cannot remember the login password to enter your Google account, then you need to use the instructions for bypassing the FRP lock for your phone model. Not all phone models can bypass the FRP protection, their owners will need to contact the official service center.
After performing a hard reset, your device will be completely wiped clean. Everything that was in the memory of your device will be deleted.
What can be done to avoid losing important information?
If important information remains in the memory of your phone, then there are the following options to save it:
Sync your data with Google contacts, Google drive. Create a backup using Titanium Backup or other programs. With the service programs for your phone, you can transfer important data to your PC.