While it is technically possible for some devices using fastboot flashing lock , it is highly unrecommended and considered dangerous. Re-locking can cause a bootloop or other instabilities, and it does not restore your warranty. HMD Global warns that once unlocked, it cannot be undone.

Unlocking provides several benefits for power users looking to extend the life of their device:

Because standard fastboot commands ( fastboot oem unlock or fastboot flashing unlock ) are generally blocked or disabled by the stock firmware, users must rely on third-party development methods. Third-Party Solutions and Service Tools

Some free or community-driven tools exist for broader Nokia Qualcomm-based devices.

Modifying system-level software carries an inherent risk of "bricking" the device, rendering it completely unresponsive. If a software flash fails or you install incompatible firmware, the device may enter an unbootable loop. Because unlocking violates standard manufacturer terms of service, official service centers will not repair software-damaged devices under warranty. Step-by-Step Unlocking Guide

This is a challenging model. Users on XDA forums have reported that many guides are for the Nokia 3.2, and applying them to the 3.4 carries a high risk of bricking. There is also no dedicated XDA section for the 3.4, indicating it's an unpopular or difficult device to modify. However, developer Hikari Calyx has indicated plans to include the Nokia 3.4 in their unlocking service. Your best bet is to monitor the community and be very cautious about experimenting with unverified methods.

Assuming you meant , below is a structured informative paper covering bootloader unlocking for that device, focusing on better (i.e., safer, more reliable, or official) methods compared to unofficial or risky alternatives.

A computer running Windows, macOS, or Linux with the latest ADB (Android Debug Bridge) and Fastboot drivers installed.

Unlocking the bootloader on a modern Nokia smartphone is an arduous journey filled with technical hurdles, potential for permanent damage, and a scarcity of reliable guides. It is an activity firmly for the advanced user who is willing to research their specific device, understand the risks, and possibly invest in a paid service for a safe and reliable unlock.

Bootloader unlocking allows custom ROM installation, root access, and system-level modifications. For Nokia 3.4, HMD does provide an official public unlock tool (unlike Motorola or OnePlus). Therefore, “better” means minimizing downsides: loss of Widevine L1, SafetyNet failure, brick risk, and voided warranty.

However, for enthusiasts and power users, the benefits of unlocking the bootloader far outweigh the risks. With the Nokia 3.4, the process is relatively safe and easy, making it an attractive option for those looking to take their device to the next level.

This is the most reliable "better" method for the Nokia 3.4. Because many variants of the Nokia 3.4 run on the MediaTek chipset (specifically the Helio series). Unlike Qualcomm variants, MediaTek devices have a vulnerability in their bootrom that can be exploited.