A fully charged battery (or at least 50%) to prevent the phone from powering off during the process.
This free method cannot unlock networks or reset FRP on newer security patches, but it can resurrect a dead phone. Nokia 220 Flash Atf Box Crack
The Nokia 220 4G receives security updates. A cracked ATF box does not support the latest flash protocols. You might end up writing an old or wrong firmware version, turning your phone into a – a paperweight that no box can recover. A fully charged battery (or at least 50%)