Click the PDA (or AP in newer Odin versions) button and select the efs-fix-regalstreak.tar.md5 file.

Regional and carrier-specific identification data.

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Download the efs-fix-regalstreak.tar.md5 file and a compatible version of Odin .

Because EFS data is unique to every individual handset, using a generic fix file may not always restore your original IMEI. In some cases, it may provide a generic IMEI that restores basic calling functionality but might not be legal or permanent in all regions. How to Use the File with Odin

The International Mobile Equipment Identity used by networks to identify your phone.

The file is a specialized flashing utility primarily used to repair corrupted EFS partitions and restore missing IMEI numbers on Samsung Android devices. What is the EFS Partition?

This specific file was developed by XDA member as a "fix-all" for various EFS-related issues.