Step 1. Connect your iPhone to computer
Download and install Fix Recovery software on your computer. Launch the program and connect your iPhone to the computer via USB cable.
Step 2. Choose the Fixing mode
Choose the mode "iOS System Recovery" on "More Tools" window. Once your iOS device is detected, click "Start" button.
Step 3. Download the firmware
After checking your current iOS version, the program will download the latest version of your iPhone firmware. Click the button "Download" and wait for the download to complete.
Step 4. Fix white screen on iPhone
When the download is completed, Fix Recovery will begin repairing your iPhone. The program will get your device out of iPhone white screen without damaging your data. Your iPhone will be restarting to normal mode in less than 10 minutes.
Tips: Follow the above steps, you will successfully get your iPhone out of white screen of death. However, if it doesn't work because of some hardware problems, you need to go to the Apple Store or Apple device repair shop nearby to repair your iPhone.