Method 1: Restore Windows 10 earlier
It may sound simple, but it doesn't matter because if you can't access Windows, you can't recover. Fortunately, you can open Troubleshooting after restarting the system 3 times in a row using the power button. This will open the restore blue screen to start the Windows downgrade process.
When the recovery screen appears, select Troubleshoot > Advanced Options > Go back to the previous version and follow the instructions on the screen.
If the process is completed successfully, because even Microsoft cannot guarantee that it will work normally, you should avoid updating to April 2018 Update again.
How to uninstall Windows 10 April 2018 Update
This works only if you upgrade in less than 10 days and the previous Windows installation has not been deleted (either manually or by system cleanup).
Return to Windows 10 before updating
Method 2: Reinstall Windows
Although this is almost the last way to fix errors on Windows 10, Microsoft also said sometimes this is the only way if the previous ways are useless. You will need the installer, if not, you must create a USB boot on another normal machine.
Download the Media Creation Tool, create a USB drive to open the Windows 10 installation version. Follow the instructions on the screen and plug in the USB device. Restart the computer from the current white screen, change the BIOS settings to boot on the USB, select Install Now and follow the steps on the screen.
Please note that installing Windows 10 means you will lose all files and applications, so don't forget to backup before you do.
When you're done, don't update Windows 10 April 2018 again.
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