Disclaimer: Advanced methods carry a high risk of permanently bricking the smartphone and should only be performed by experienced individuals. Method 1: Restoring an EFS/Modem Backup
Use the "Repair IMEI" option and enter your phone's original IMEI (found on the back of the phone or the box). The tool will flash the necessary modem and EFS files. Method 4: Writing the IMEI with IMEI Tool
⚠️ WARNING: This method requires root access and a Windows 7/10 64-bit environment. One wrong step can brick your device.
Note: These are paid, professional tools used by technicians. Connect the phone in USB Debugging mode or Flashmode. Select the model in the tool. repair imei sony xz3
If you want, I can:
Ensure your Xperia XZ3 is charged to at least 60%.
Note: This process requires an unlocked bootloader and root access on your Xperia XZ3 to modify root-level partitions. Enable on your phone via Developer Options. Disclaimer: Advanced methods carry a high risk of
Release the button when the indicator LED turns (indicating Flashmode).
Before using advanced tools, try these basic steps to see if the IMEI reappears: Restart the device : Hold the button and the
Before attempting complex software repairs, perform these basic checks to rule out minor bugs or network blocks. Step 1: Check the Status via Dial Codes Method 4: Writing the IMEI with IMEI Tool
If you created a backup ( TA.img ) using tools like TWRP or FlashTool before modifying your device, you can flash it back using Fastboot commands: fastboot flash TA TA.img
Method 1: Restoring from an EFS/TA Partition Backup (Safe & Recommended)
You will download the official Sony firmware (a .sin file) for your specific Xperia XZ3 model and use a third-party tool called "Newflasher" to flash it manually to your phone. This process can be more thorough than Xperia Companion's automated repair.