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 1 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 1?
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 reset the phone to factory settings. Removal of viruses that interfere with work and give permanent errors. Solving problems that arose after installing some applications and remained after they were removed from the phone.
Disadvantages of Hard Reset:
Permanently deletes all data on the device. The need to back up contacts, settings and media files. Not all viruses on Android will be removed after a factory reset.
What needs to be done before the Hard Reset operation.
Before doing a hard reset on your phone, be sure to make sure that you know the login / password for accessing your google account. You can sign out of your google account before resetting. In this case, after performing a factory reset, you do not need to enter the login password for your Google account and you can immediately use your device. In case you have already done a factory reset and cannot remember the login and password for logging into your Google account, for most models there are instructions for bypassing protection (FRP). Some new phone models may have problems with bypassing the FRP protection and for this you 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:
Synchronize your phone with Google contacts, Google drive. Backup your contacts and information. With the service programs for your phone, you can transfer contacts, media files, and important data to your PC.