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.
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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
How to Backup or Restore QCN/EFS on Qualcomm devices
You can backup or restore QCN/EFS on Qualcomm devices with the help of QPST tool. You can download this tool from the download box given below:
Filename | QPST_2.7.472.4.7z |
File type | 7z zip file archive |
Last updated | Jan 28 |
Download | Server 1 |
Steps to Backup QCN/EFS on Qualcomm devices
Download the QPST package and run “QFIL.exe” file.
Make sure that the program is in “Lenovo HS-USB Diagnostics” mode.
In the top menu of the program, navigate to “QFIL” select “Tools” >> “QCN Backup Restore”
A new window will open. Click on “Backup QCN” and wait for the end of the backup process. It will show the following process:
Start Download QCN COM Port number:7 Checking if phone is connected... Is PhoneConnected: Passed. Phone is connected Sent SPC code to the phone successfully Downloading QCN file : C:\temp\00000000.qcn Done downloading the qcn file: C:\temp\00000000.qcn Finish Backup QCN
Note: By default, the backup QCN file with the name of “00000000.qcn” will be saved to “C: \ temp \”. You can further access this file if you want to.
Steps to Restore QCN/EFS on Qualcomm devices
Download the QPST package and run “QFIL.exe” file.
Make sure that the program is in “Lenovo HS-USB Diagnostics” mode.
In the top menu of the program, navigate to “QFIL” select “Tools” >> “QCN Backup Restore”
A new window will open. Click on the “Browse” button and locate file “00000000.qcn” and click “Open.” Then click on “Restore QCN” and wait for the restore process. The process log will look something like this:
Process Index:0 Start Restore QCN COM Port number:7 Uploading QCN file : C:\temp\00000000.qcn Checking if phone is connected... Done uploading the QCN file: C:\temp\00000000.qcn Finish Restore QCN
After this, you can restart your Qualcomm device and check whether the details have been restored or not. If not, then try the process again.
So this is how you can backup and restore the QCN/EFS on Qualcomm devices. Make sure to keep these files secure as they contain confidential data such as IMEI numbers, which can easily be used for bad purposes. If you’re facing any problem in this tutorial then feel free to comment down below.