There are moments when you unexpectedly lose crucial device details like IMEI numbers, Wi-Fi MAC address, or Bluetooth keys, leaving your device non-functional. If you encounter such issues, restoring these details is critical for ensuring proper device functionality. Typically, people rely on a nandroid backup or copy details from a similar device, but there’s a simpler, more efficient method: using QCN/EFS files on Qualcomm devices.
In this guide, we’ll show you how to back up and restore QCN/EFS files on Qualcomm devices using the QPST Tool. Read on to safeguard and restore your device details effectively.
What Are QCN and EFS Files?
QCN and EFS files contain sensitive, device-specific information that ensures the smooth operation of your smartphone. These files are embedded deep within your phone’s firmware and are not easily accessible. They hold vital data such as:
- IMEI numbers: Unique identification for mobile devices.
- Wi-Fi MAC address: Ensures Wi-Fi connectivity.
- Bluetooth keys: Facilitates secure Bluetooth connections.
If these files are corrupted, missing, or replaced with invalid values, your device might lose its network connectivity or show a null IMEI error. Backing up these files is essential to prevent permanent loss or malfunctions