How to Repair EFS and IMEI on Samsung Galaxy S4 I9505
If you have a Samsung Galaxy S4 I9505 that has lost its IMEI or EFS data, you may not be able to make or receive calls, send or receive SMS, or connect to mobile data. This can happen due to a faulty firmware update, rooting, flashing, or other software issues. Fortunately, there are some ways to fix this problem and restore your phone's functionality. Here are some steps you can try to repair EFS and IMEI on your Samsung Galaxy S4 I9505.
Backup your data. Before you attempt any repair, it is always advisable to backup your important data such as contacts, messages, photos, etc. You can use Samsung Smart Switch, Google Drive, or any other backup app of your choice.
Download and install Z3X Samsung Tool Pro on your computer. This is a professional tool that can repair various issues on Samsung devices, including EFS and IMEI. You can download it from https://z3x-team.com/. You will also need a Z3X box or dongle to use this tool.
Download and install Samsung USB drivers on your computer. These drivers are necessary for your computer to recognize your phone when connected via USB cable. You can download them from https://developer.samsung.com/mobile/android-usb-driver.html.
Enable USB debugging on your phone. To do this, go to Settings > About phone > Software information and tap on Build number seven times until you see a message that says \"You are now a developer\". Then go back to Settings > Developer options and enable USB debugging.
Connect your phone to your computer via USB cable and launch Z3X Samsung Tool Pro. Select your model (I9505) from the drop-down menu and click on the Scan button. The tool should detect your phone and show its information.
Click on the Backup tab and then click on the Read EFS button. This will create a backup of your current EFS data and save it as a .tar file in the Z3X folder on your computer. You can use this file to restore your EFS data in case something goes wrong.
Click on the Repair tab and then click on the Repair IMEI button. This will open a new window where you can enter your original IMEI number. You can find this number on the back of your phone under the battery or on the box of your phone. Enter the IMEI number and click on Write IMEI.
Wait for the process to complete and then reboot your phone. Your phone should now have a valid IMEI number and be able to make and receive calls, send and receive SMS, and connect to mobile data.
If this method does not work for you, you can try other methods such as flashing a stock firmware with Odin, restoring an EFS backup from another working I9505 device, or using other tools such as EFS Pro or imeibkp. However, these methods may require more technical skills and may have more risks of bricking your phone. Therefore, proceed with caution and at your own responsibility. aa16f39245