Fix Invalid IMEI and SN issue of Qualcomm Smartphones 

Fix Invalid IMEI and SN issue of Qualcomm Smartphones 

How To Fix Invalid IMEI and SN issue of Qualcomm Smartphones

I received many queries that How to solve and fix Invalid IMEI and SN issue of Qualcomm Smartphone ? or My Smartphone’s IMEI number and the serial number of the device has turned to 00000000 How to solve it? on We Observed’s Social pages and in comment sections.After doing some deep research I found two IMEI and SN Writer or IMEI repair software and some IMEI changer method to solve/fix the invalid IMEI and SN problem of Qualcomm Smartphone. And Now I am posting this tutorial on how to Fix Invalid IMEI and SN Problem and it will show you Two Working and personally tested  Methods to fix invalid IMEI and SN of Any Qualcomm Smartphone.Just make sure that your smartphone is Qualcomm smartphone by following one of the following methods.

For MTK Smartphone visit Here:-
                       How To Solve Invalid IMEI and Serial Number Problems of Any Android Smartphone

How to Know that Your Android Smartphone is a Qualcomm Device or Not?

Now if you really want to know that whether your Android devices are Qualcomm devices or not, then there are two very common Methods:-
  • With a tiny Android App:-
    1. Open Google Play Store.
    2. Search “CPU-Z” in it and Download it.
    3. When the Application is Installed, Open the app and you will see all your phones and hardware components models.
    4. On the Main Screen, you will see about 5 menu buttons at the top Click on SOC (System on Chips)
    5. On the SOC menu, you will see the chip and model of your device boldly written at the top portion of your screen.

CPU-Z – Android Apps on Google Play

 Rating: 4.5 – ‎261,185 votes – ‎Free

  • Method 2 is very simple and it is the only way to know that Your phone is Qualcomm Device or not, when your phone is Bricked or not Accessible.In this method, you just have to type Smartphone’s Brand name and Model number on the Google Search Bar and click on Search button.By using this method you will get all of the information about your Smartphone Easily.

Now, after confirmation that your smartphone is Qualcomm based device, let’s move to the one of the most important part of this post that where to find IMEI and SN of your Qualcomm smartphone.

  • Find IMEI and Serial No. of Your Device:-
      • If IMEI and SN is Not Lost than,
      • Method 1: – Dail *#06# To check Your IMEI number, To check Serial Number Go to settings>About Phone>Status.
      • Method 2: – Uncle mobile tool -> Device Information to check the serial number.
  • If IMEI and SN is Lost than,
    • Method 3: – You Can find the IMEI of your Device, from the box of your phone or information under the battery. In some cases, a dual SIM phone will have the same IMEI for both SIM slots.In this case, your carrier doesn’t allow this, or if you have some other reason you need to change the stock IMEI, you may need to generate/calculate /find a new IMEI with the correct checksum
So Now, we are moving to main part that how to fix Invalid IMEI and SN Problems of Qualcomm Smartphones. Below is Two method to write IMEI, SN, Wifi add and Bluetooth Address on any Qualcomm Smartphone.

1. How to FIX IMEI and SN Permanently Using QMSL IMEI and SN Writer Tool

How to solve imei
“No Root Required to fix IMEI and SN Permanently using This Method”
QMSL IMEI and SN Writer tool is developed by CK Telecom. QMSL IMEI and SN Writer can Read & Permanent write SN, IMEI, WIFI & Bluetooth address into any Qualcomm SmartPhone.All Steps are Described below.It supports most of the Qualcomm Platform.


  1. A Windows PC or Lappy.
  2.  Qualcomm USB Driver of Your Qualcomm Smartphone. Download and Install Qualcomm USB drivers from Here or Here.

    IMEI repair driver
  3. Make a complete backup of Your Samsung Smartphone.
  4. Download QMSL IMEI and SN Writer ( an IMEI repair software free download ) from Here
  5. Qualcomm Smartphone with more than 80% Battery life.
  6. A Data/USB cable.
  1.  Download and Extract the package of QMSL IMEI and SN Writer from the Link from Requirements.
  2. Download and Install the Qualcomm USB driver from the links in requirements.
  3. Open the Qwriter tool folder then Find and Run the “Qwrite_Writer.exe”.
  4. Choose the item you want to write into the phone, then input Your Smartphone’s correct corresponding numbers Like IMEI, SN, Wifi add. and Bluetooth Address.
  5. Power on Your Smartphone.
  6. Connect to PC with USB cable and wait for any required drivers to install.
  7. Click on “Start” Button to write items into the phone.
    How to solve Invalid IMEI and SN Problem of Qualcomm SmartPhone
  8. If nothing Happen on screen, Restart your phone and Connect your phone in Switched ON mode through USB data cable and wait till it flashes and done. An OK message will appear, it means You have Fixed IMEI and SN number Problem successfully.

2. How to Fix IMEI and SN Permanently Using Qualcomm Smartphone Writer IMEI Tool only for CDMA

“Only for CDMA “


How to solve Invalid IMEI and SN Problem of Qualcomm SmartPhone



Qualcomm Smartphone Write IMEI Tool by Uniscope is a small application which allows you to flash IMEI, MEID or ESN, Bluetooth Address and WLAN Address on any Qualcomm Based smartphone and Tablets. It supports a wide range of Qualcomm platform like Qualcomm MSM8916, MSM8909, MSM8939, MSM8209, MSM8592. This function only works when your device is having the CDMA function, and if your device isn’t having the CDMA function then it should not be selected. While Opening the Settings, you will be asked to enter the Password and The default password is ustest.


  1. A Windows PC or Lappy.
  2. Download Uniscope Qualcomm Driver from Here
  3. Make a complete backup of Your Samsung Smartphone.
  4. Download Qualcomm Smartphone Write IMEI Tool (an IMEI repair software ) from Here.
  5. Qualcomm “CDMA” Smartphone with more than 80% Battery life.
  6. A Data/USB cable.
  1. Download, Extract and install Uniscope Qualcomm Driver on your Computer from the link at requirements.
  2. Now, Download and extract Qualcomm Smartphone Write IMEI Tool from the link at requirements.
  3. Open Qualcomm_Smartphone_Write_IMEI.exe.
  4. Now, Click on the Settings button and enter ustest to Login.
  5. In the Settings Dialog box, you will see several options. Select Write IMEI1 (if you have dual SIM device then also select Write2 option) and click on OK button. 
  6. Now, Select the COM Port as USB and Enter the IMEI into the input box.
  7. Restart your Device and Connect it to the computer using the USB Cable. 
  8. Now, Click on the Write1 Button to begin the Writing Process.
  9. Once, Writing process is completed, you will be able to see Green Pass Box on the screen.

Notes/ Precaution/ Warning Before rewriting IMEI and SN into a Smartphone:-

  1. If Writer hangs at setting up connection just unplug the USB cable and reattach it, Tool should now resume.
  2. Do not disconnect the cable or turn off the Smartphone once the process has started.
  3. Never try to Downgrade Your Smartphone. Either IMEI no., SN, Wifi/ Bluetooth Address will be lost or Smartphone will be bricked or Dead.
  4.  Never Flash wrong Firmware or Firmware of other smartphones on Any Android Smartphone.It can make your Smartphone DEAD. “I have tried two times now I have 2 dead Smartphone.”
  5. Flashing is sometimes risky so TRY IT ON YOUR RISK.We are not responsible for any damage.
  6. This post is for education purpose only, In most of the Country Changing IMEI and SN is illegal so Don’t try to write IMEI and SN other than your Smartphone.
That’s All, I Hope this Guide will Help you to “Fix Invalid IMEI and SN Problem of Qualcomm smartphones”. Here We guided you to how to regain serial number to the one which is on your device box ( You should not change serial number to something else)SN consist warranty data so Using Different serial code for infinite warranty is not a good idea and it is also illegal.
Sourabh Kumar

About Sourabh Kumar

Sourabh Kumar is the founder of, he is a Tech savvy Engineer, Artist, and a Blogger, living in Jaipur, India. He is a fan of photography, technology, Robotics, and Creative Artworks. He is also interested in programming and innovation. He loves technology, gadgets and Spends lots of time with them.

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5 Comments on “Fix Invalid IMEI and SN issue of Qualcomm Smartphones ”

  1. Sir, You solved my problem.saved my money. At shop they are charging 300-500rs to solve this problem, and I solved it for free using first method….
    Thankyou very much.

  2. After using the first method my imei number got changed succesfully thanks a lot nut my serial number is not changing.

    1. Hi Aakash! Thanks for connecting with us. Randomly generated IMEI is not really safe, but if you don’t have any option then you have to go with it. Just make sure to search the old ones first. Box, Bill, receipt, order details, anywhere. By the way, you can o to the service center, they will find imei using SN. So try these options first. Thank you keep visiting.

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