Warning: Android 11/12 updates may overwrite TWRP. You'll need to reflash after system updates.
This cannot be stressed enough. This includes photos, contacts, messages, and app data. nokia 3.4 unlock bootloader
Unlike some manufacturers that provide official unlocking tools directly on their websites (like OnePlus or Xiaomi), HMD Global (the company behind Nokia phones) has a strict policy regarding bootloaders. Historically, Nokia devices are notoriously difficult to unlock. Warning: Android 11/12 updates may overwrite TWRP