(Device Firmware Update) instead of Recovery Mode. This is a deeper restore state that may bypass software-level communication blocks. Try iTunes (Official Restore)

For iPhone users, especially those involved in repairs, refurbishing, or simply trying to extend the life of an older device, 3uTools is an indispensable utility. It offers a suite of features from data migration to flashing firmware that often surpasses the capabilities of Apple’s own iTunes. However, with great power comes great complexity.

: If the error persists across different computers and cables, it may indicate a hardware failure in the baseband chip or related circuits (common in devices with physical damage or after reballing). Reinstall Drivers

3uTools has a feature that mirrors Apple's native iTunes restore process, which handles baseband data more gently.

Physical damage to the baseband CPU or power supply chip, often caused by drops or liquid exposure.