Once completed, the phone will restart and show the initial setup screen, just like when it was new. Use this if the phone is stuck on the logo, won’t start, or you forgot the password.
A black screen with a red LED light may appear. Keep holding until you see the “BlackBerry” logo with a progress bar. how to reset blackberry 10 os to factory settings
Enter your device password if prompted.
The device will reboot and begin the wipe process. This may take 10–20 minutes. Do not interrupt the process. Once completed, the phone will restart and show
Tap Security Wipe .