Using such tools can result in:
: Authorities can blacklist an IMEI, making the phone unusable on most networks.
That being said, here are some general insights:
Instead, identify the real problem (blocked, stolen, software glitch) and use legal solutions. If the phone is legally yours and has a software issue, seek authorized service center repair to restore original IMEI – not change it.
Tampering with a device’s IMEI is highly discouraged for several reasons: Nokia 105 user guide: Keys and parts - HMD
Modern Nokia feature phones have signed firmware that prevents unauthorized changes.