There are lots of time when you unexpectedly lose your device important details. These important details include IMEI numbers, wifi address gets null or Bluetooth goes null. In this situation, you have no choice but either copy such details from a new device or to restore these details from a nandroid backup.
However, there’s an easy way to fix it as well. You can use the QCN/EFS files on your Qualcomm device to fix such problems. Today in this article, we will help you to backup and restore your device QCN/EFS files. So keep reading this article to the last.
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What are QCN/EFS on Qualcomm devices
QCN and EFS files contain cellphone manufacturer utility program which is used to edit many features of a modern smartphone. These files are hidden deep inside a phone firmware and are pretty hard to access or update them. However, these files hold special information such as IMEI numbers, wifi address and Bluetooth address keys. So in case you need to restore your device from any invalid or null IMEI problems, then you need to back up these files.
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 these 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.