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Nathan Harris
Nathan Harris

The Ultimate Guide to Fixing IMEI and EFS on Samsung Galaxy S4 I9505 with Z3X Box



How to Repair IMEI and EFS on Samsung Galaxy S4 I9505




Introduction




If you own a Samsung Galaxy S4 I9505, you may have encountered some issues with your IMEI and EFS. These are two important components of your phone that store your identity and network information. Sometimes, due to flashing custom ROMs, rooting, or other modifications, you may lose or corrupt your IMEI and EFS, resulting in no signal, invalid SIM card, or unknown baseband. In this article, we will show you how to repair IMEI and EFS on Samsung Galaxy S4 I9505 using two methods: Z3X Box and EFS Professional. But before we proceed, let's understand what IMEI and EFS are and why you need to repair them.




I9505 Efs Repair Z3x.epub


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What is IMEI and EFS?




IMEI stands for International Mobile Equipment Identity. It is a unique 15-digit number that identifies your phone and its model. You can find your IMEI by dialing *#06# on your phone or by checking the sticker under the battery. IMEI is used by your network provider to authenticate your phone and allow you to make calls, send messages, and access data services.


EFS stands for Encrypting File System. It is a hidden partition on your phone that stores sensitive information such as IMEI, MAC address, product code, serial number, and network settings. EFS is encrypted and protected by a key that is generated during the first boot of your phone. EFS is essential for your phone to communicate with the network and register on it.


Why do you need to repair IMEI and EFS?




If your IMEI or EFS gets corrupted or erased due to some reason, you will face various problems with your phone. Some of the common symptoms are:



  • No signal or network connection



  • Invalid SIM card or SIM not recognized



  • Unknown baseband or null IMEI



  • Unable to make or receive calls



  • Unable to send or receive messages



  • Unable to access data services



  • Unable to update firmware or software



These problems can render your phone useless and prevent you from using it normally. Therefore, you need to repair IMEI and EFS to restore your phone's functionality and network connectivity.


What are the risks of repairing IMEI and EFS?




Repairing IMEI and EFS is not a simple task. It involves modifying system files and using specialized tools that can potentially damage your phone if not used properly. Some of the risks of repairing IMEI and EFS are:



  • Bricking your phone or making it unbootable



  • Losing your warranty or violating the terms of service



  • Breaching the law or regulations in some countries



  • Changing your original IMEI or identity



  • Causing security issues or vulnerabilities



Therefore, you should only attempt to repair IMEI and EFS if you know what you are doing and if you have a valid reason for doing so. You should also backup your original IMEI and EFS before repairing them in case something goes wrong.


How to backup IMEI and EFS before repairing




Before you proceed to repair IMEI and EFS on Samsung Galaxy S4 I9505, it is highly recommended that you backup your original IMEI and EFS files. This way, you can restore them if anything goes wrong or if you want to revert back to the stock settings. There are two ways to backup IMEI and EFS on Samsung Galaxy S4 I9505: using Z3X Box or using EFS Professional.


Using Z3X Box




Z3X Box is a professional tool that can be used to repair various Samsung devices. It can also be used to backup IMEI and EFS on Samsung Galaxy S4 I9505. To use Z3X Box, you need the following:



  • A Z3X Box device with Samsung activation



  • A USB cable compatible with Samsung Galaxy S4 I9505



  • A computer with Windows OS and Z3X software installed



  • A rooted Samsung Galaxy S4 I9505 with USB debugging enabled



To backup IMEI and EFS using Z3X Box, follow these steps:



  • Connect your Z3X Box device to your computer using a USB cable.



  • Launch Z3X software on your computer.



  • Select Samsung Tool Pro from the menu.



  • Select I9505 model from the list.



  • Select Samsung diagnostic port in port settings.



  • Click on Backup button under Backup/Restore tab.



  • Select Backup efs option from the pop-up window.



  • Select a folder where you want to save the backup files.



  • Click on OK button to start the backup process.



  • Wait until the backup process is completed.



  • You will see a message saying Backup efs done.



  • You will find two files named efs.img.tar.gz and efs.img.tar.md5 in the selected folder.



  • These are your backup files for IMEI and EFS.



Using EFS Professional




EFS Professional is a free tool that can be used to backup and restore EFS on various Samsung devices. It can also be used to backup IMEI on Samsung Galaxy S4 I9505. To use EFS Professional, you need the following:



  • A USB cable compatible with Samsung Galaxy S4 I9505



  • A computer with Windows OS and .NET Framework 4 installed



  • A rooted Samsung Galaxy S4 I9505 with USB debugging enabled



  • EFS Professional software downloaded from here: https://forum.xda-developers.com/t/tool-efs-professional-v2-0-70-samsung-android-devices-advanced-feature-set.1834918/



To backup IMEI and EFS using EFS Professional, follow these steps:



  • Extract the downloaded file into a folder on your computer.



  • Connect your Samsung Galaxy S4 I9505 to your computer using a USB cable.



  • Launch EFS Professional.exe from the extracted folder.



  • You will see a message saying Device connected successfully.



  • Select Backup tab from the menu.



  • Select Device Filter option from the drop-down menu.



  • Select GT-I9505 model from the list.



  • Select Backup All Partitions option from the drop-down menu.



  • Select a folder where you want to save the backup files.



  • Click on Backup button at the bottom right corner.



  • You will see a message saying Backup operation complete!



  • You will find several files named after different partitions in the selected folder.



  • The files named nv_data.bin.md5.gz , nv_data.bin.gz , nv.log , nv.log.md5 , nv_data.bak.md5.gz , nv_data.bak.gz , nv_data.bak2.md5.gz , nv_data.bak2.gz are your backup files for IMEI.



  • The file named efs.img.gz is your backup file for EFS.



How to repair IMEI and EFS using Z3X Box




If you have backed up your original IMEI and EFS using Z3X Box, you can also use it to repair them if they get corrupted or erased. To use Z3X Box for repairing IMEI and EFS on Samsung Galaxy S4 I9505, you need the following:



  • A Z3X Box device with Samsung activation



  • A USB cable compatible with Samsung Galaxy S4 I9505



  • A computer with Windows OS and Z3X software installed



  • A rooted Samsung Galaxy S4 I9505 with USB debugging enabled



  • Your backup files for IMEI and EFS



To repair IMEI and EFS using Z3X Box, follow these steps:



  • Connect your Z3X Box device to your computer using a USB cable.



  • Launch Z3X software on your computer.



  • Select Samsung Tool Pro from the menu.



  • Select I9505 model from the list.



  • Select Samsung diagnostic port in port settings.



  • Click on Restore button under Backup/Restore tab.



  • Select Restore efs option from the pop-up window.



  • Select the folder where you have saved your backup files.



  • Select the file named efs.img.tar.gz or efs.img.tar.md5 from the list.



  • Click on OK button to start the restore process.



  • Wait until the restore process is completed.



  • You will see a message saying Restore efs done.



  • Your EFS is now restored.



  • Click on Repair button under Repair tab.



  • Type your original IMEI number in the IMEI field.



  • Click on Repair button to start the repair process.



  • Wait until the repair process is completed.



  • You will see a message saying Repair done.



  • Your IMEI is now repaired.



How to repair IMEI and EFS using EFS Professional




If you have backed up your original IMEI and EFS using EFS Professional, you can also use it to repair them if they get corrupted or erased. To use EFS Professional for repairing IMEI and EFS on Samsung Galaxy S4 I9505, you need the following:



  • A USB cable compatible with Samsung Galaxy S4 I9505



  • A computer with Windows OS and .NET Framework 4 installed



  • A rooted Samsung Galaxy S4 I9505 with USB debugging enabled



  • EFS Professional software downloaded from here: https://forum.xda-developers.com/t/tool-efs-professional-v2-0-70-samsung-android-devices-advanced-feature-set.1834918/



  • Your backup files for IMEI and EFS



To repair IMEI and EFS using EFS Professional, follow these steps:



  • Extract the downloaded file into a folder on your computer.



  • Connect your Samsung Galaxy S4 I9505 to your computer using a USB cable.



  • Launch EFS Professional.exe from the extracted folder.



  • You will see a message saying Device connected successfully.



  • Select Restore tab from the menu.



  • Select Device Filter option from the drop-down menu.



  • Select GT-I9505 model from the list.



  • Select Restore All Partitions option from the drop-down menu.



  • Select the folder where you have saved your backup files.



  • Select the file named efs.img.gz from the list.



  • Click on Restore button at the bottom right corner.



  • You will see a message saying Restore operation complete!



  • Your EFS is now restored.



  • Select Backup/Restore NV Data tab from the menu.



  • Select Device Filter option from the drop-down menu.



  • Select GT-I9505 model from the list.



  • Select Restore NV Data option from the drop-down menu.



  • Select the folder where you have saved your backup files.



  • Select the file named nv_data.bin.gz or nv_data.bin.md5.gz from the list.



  • Click on Restore button at the bottom right corner.



  • You will see a message saying Restore operation complete!



  • Your IMEI is now restored.



Conclusion




In this article, we have shown you how to repair IMEI and EFS on Samsung Galaxy S4 I9505 using two methods: Z3X Box and EFS Professional. We have also explained what IMEI and EFS are, why you need to repair them, and what are the risks of repairing them. We hope that this article has been helpful for you and that you have successfully repaired your IMEI and EFS on your Samsung Galaxy S4 I9505. However, if you still face any problems or have any questions, feel free to leave a comment below or contact us through our website. We will try our best to assist you. Thank you for reading!


FAQs




Here are some frequently asked questions about repairing IMEI and EFS on Samsung Galaxy S4 I9505:



  • Q: Can I use any other tool besides Z3X Box or EFS Professional to repair IMEI and EFS on Samsung Galaxy S4 I9505?



  • A: There are some other tools that claim to repair IMEI and EFS on Samsung devices, such as Octopus Box, Chimera Tool, or Odin. However, we cannot guarantee their compatibility or reliability with Samsung Galaxy S4 I9505. Therefore, we recommend using Z3X Box or EFS Professional as they are proven to work for this device.



  • Q: Can I use this method to repair IMEI and EFS on other Samsung devices?



  • A: This method may work for some other Samsung devices that have similar hardware and software specifications as Samsung Galaxy S4 I9505. However, we cannot guarantee that it will work for all devices. Therefore, we advise you to check the compatibility of your device with Z3X Box or EFS Professional before attempting to repair IMEI and EFS on it.



  • Q: Can I use this method to change my IMEI number?



  • A: No, you cannot use this method to change your IMEI number. This method is only meant to restore your original IMEI number that was assigned to your device by the manufacturer. Changing your IMEI number is illegal in most countries and can cause serious problems with your network provider and authorities. Therefore, we strongly advise you not to change your IMEI number under any circumstances.




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