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I9505 Efs Repair Z3x


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How to Repair EFS on Samsung Galaxy S4 I9505 with Z3X Box


EFS is a partition on the internal memory of Samsung devices that stores important information such as IMEI, serial number, Bluetooth and Wi-Fi addresses, product code, etc. Sometimes, EFS can get corrupted or erased due to flashing custom ROMs, rooting, or other software modifications. This can cause problems such as no network signal, invalid IMEI, unknown baseband, etc.


In this article, we will show you how to repair EFS on Samsung Galaxy S4 I9505 with Z3X Box, a professional tool for Samsung devices. Z3X Box can backup and restore EFS, reset MSL, repair IMEI, and unlock network lock. You will need a rooted I9505 with a custom recovery installed, a USB cable, a PC with Z3X Box software and drivers installed, and a backup of your original EFS (if you have one).


Steps to Repair EFS on Samsung Galaxy S4 I9505 with Z3X Box


Power on your phone and enable USB debugging mode. To do this, go to Settings > About device > tap on Build number seven times > go back to Settings > Developer options > enable USB debugging.


Type *#0808# on your phone dialer and select DM+MODEM+ADB. This will enable diagnostic mode on your phone.


Type *#9090# on your phone dialer and select DM over UART. This will set the communication mode to UART.


Connect your phone to your PC via USB cable and wait for the drivers to install.


Open Z3X Box software on your PC and select I9505 as the model.


Select Samsung diagnostic port in port settings. You can check the port number in Device Manager under Ports (COM & LPT).


Click on Backup button and select EFS. This will backup your current EFS to a file on your PC. You can use this file to restore EFS later if needed.


Click on Repair button and enter the IMEI number that you want to write to your phone. You can find your original IMEI number on the back of your phone or on the box.


Click on OK button and wait for the process to complete. Z3X Box will reset EFS, bypass MSL, repair IMEI, and reboot your phone.


Check if your phone has network signal and valid IMEI. You can dial *#06# to check your IMEI.


Congratulations! You have successfully repaired EFS on Samsung Galaxy S4 I9505 with Z3X Box. If you have any questions or problems, please leave a comment below.


Troubleshooting Tips


If you encounter any errors or problems while repairing EFS on Samsung Galaxy S4 I9505 with Z3X Box, you can try the following tips:


Make sure your phone is rooted and has a custom recovery installed. You can use tools like Odin or Heimdall to flash a custom recovery such as TWRP or CWM.


Make sure your phone battery is charged at least 50% before starting the process.


Make sure you have a backup of your original EFS file. You can use Z3X Box or other tools like EFS Professional or Samsung Tool to backup EFS.


Make sure you enter the correct IMEI number that matches your phone. You can use tools like IMEI Generator or IMEI Changer to generate or change IMEI.


Make sure you select the correct port and model in Z3X Box software. You can check the port number in Device Manager under Ports (COM & LPT).


If you get an error like "Bypass MSL... error" or "Repairing... error", you can try to reboot your phone into recovery mode and select CP logging. This will restart your phone and enable CP logging mode. Then, you can try to reset MSL and repair IMEI again with Z3X Box.


If you still have no network signal or invalid IMEI after repairing EFS, you can try to flash a stock firmware or a modem file to your phone. You can use tools like Odin or Heimdall to flash a stock firmware or a modem file that matches your phone model and region.


Conclusion


EFS is a vital part of Samsung devices that stores important information such as IMEI, serial number, Bluetooth and Wi-Fi addresses, product code, etc. If EFS gets corrupted or erased due to flashing custom ROMs, rooting, or other software modifications, it can cause problems such as no network signal, invalid IMEI, unknown baseband, etc. To fix t




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