My Nokia lumia 525 windows 10 phone installed updates and while restarting itself it froze and is not switching on it just shows the "NOKIA" screen for hours
When you are ready plug the phone into your computer's USB and use the tool to revert to official. If you want, you can try again later to get it to 10.
It may help to remove the SD card and SIM before flashing and when upgrading. YMMV
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