A black screen with a red LED light may appear. Keep holding until you see the “BlackBerry” logo with a progress bar.
On the device, go to Settings → Security and Privacy → Security Wipe . how to reset blackberry 10 os to factory settings
Ensure the device is powered off completely. A black screen with a red LED light may appear
Enter your device password if prompted.
Here’s a clear, step-by-step guide you can use or share: Resetting a BlackBerry 10 device (such as the Z10, Q10, Z30, Classic, Leap, or Passport) erases all user data and restores the phone to its original out-of-box state. There are two main methods: a software reset from within the OS, and a hardware key method if the device won’t boot. Method 1: Reset from Settings (Device Boots Normally) Step 1: Back up your data (optional but recommended). Connect your BlackBerry to a computer with BlackBerry Link or use a local backup to an SD card. Ensure the device is powered off completely
The device will reboot and begin the wipe process. This may take 10–20 minutes. Do not interrupt the process.