Below is a guide on how to address this using a specialized fix firmware. Understanding the "Unknown Baseband" Problem
Fixing the "Unknown Baseband" Issue on Samsung Galaxy A12 (SM-A125F) Go to product viewer dialog for this item. Samsung Galaxy A12 (SM-A125F) Below is a guide on how to address
is showing "Unknown Baseband" in the settings, you’ve likely lost your IMEI and network connectivity. This common issue usually stems from software corruption after a failed update or root attempt, though it can sometimes be hardware-related. though it can sometimes be hardware-related.