Enable and USB Debugging in Developer Options.
Maintain at least a 10%–70% charge to prevent the device from shutting down during critical flashes. nokia 3.4 unlock bootloader
Boot the phone into by holding Volume Down + Power while connected to a PC. Enable and USB Debugging in Developer Options
A Windows computer (Windows 7 or later) is required for most tools; Linux and macOS are generally not supported for these specific services. A Windows computer (Windows 7 or later) is
Some older Nokia devices can use free tools like the Nokia Bootloader Unlock Tool , which generates an OTP (One-Time Password) to bypass the lock. However, these are often less effective on newer models like the 3.4 compared to the remote prototype method.
Experienced users can attempt to flash these binaries themselves if they have access to specific internal tools.