Choose your previous backup and specifically check the "EFS" and "Modem" boxes. Swipe to restore and reboot.
The partition stores your unique IMEI, Bluetooth addresses, and Wi-Fi MAC. If this partition gets wiped or corrupted (often during a bad ROM flash), the baseband has no identity to broadcast.
If a software fix via EDL fails, hardware repair costs $60–$120. If the Snapdragon chip is dead, replacement motherboard ($150+) is cheaper.
The "Baseband Unknown" error indicates that your phone’s modem (the hardware responsible for cellular connectivity) is failing to communicate with the operating system. For devices running on chipsets (found in Samsung, Xiaomi, OnePlus, Google Pixel, and Motorola devices), this is often a software corruption issue rather than a hardware death. baseband unknown fix qualcomm
Before pursuing technical repairs, start with basic software resets to rule out minor glitches. Check Status : Navigate to Settings > About Phone > Software Information
If you have flashed NON-HLOS.bin and restored QCN but still see the issue is physical.
There are several third-party tools available that can help fix the "Baseband Unknown" error. Some popular options include: Choose your previous backup and specifically check the
The error is terrifying, but on Qualcomm devices, it is fixable roughly 85% of the time via software. Unlike MediaTek or Exynos, Qualcomm provides engineering tools (QPST, QFIL) that allow deep-level restoration.
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Using a mismatched NON-HLOS.bin (modem firmware) from a different Android version or region. For example, flashing a Global ROM over a Chinese variant without updating the modem. If this partition gets wiped or corrupted (often
Troubleshooting and Fixing "Unknown Baseband" on Qualcomm Devices
Click Start to write the calibration data back to the modem chip.