Unlocking the bootloader on a (codenamed Doctor Strange or DRS ) is not officially supported by HMD Global. Unlike some other manufacturers, Nokia does not provide an official unlock key or portal for this specific model.
Do not buy a Nokia 3.4 expecting to unlock the bootloader. If you already own one, you cannot root or flash custom ROMs. Consider a device from Xiaomi (with unlock permission), Motorola, Google Pixel, or OnePlus for development.
, who had discovered a "secret passage." By using the "abl" binary files from engineering prototype units, one could temporarily replace the retail lock with a version that actually listened to the fastboot flashing unlock command. Leo had two choices:
A specialized "engineering bootloader" file applied to your device by a technician. 3. Standard Fastboot Commands
Q: Can I lock the bootloader again? A: Yes, you can lock the bootloader again using the fastboot oem lock command, but this may not be possible if you've made significant changes to your device. nokia 3.4 unlock bootloader