Before understanding the fix, we must understand the problem.
The EFS (Encrypted File System) partition is a critical component in all Samsung Galaxy devices (and many other Android phones). It acts as the phone's digital passport. Inside this small, encrypted storage area, the modem firmware stores:
What corrupts the EFS partition?
When corrupted, your phone might fail to read the IMEI, leading to "Not Registered on Network," "No Service," or permanent airplane mode.
If you flash this on an Exynos Samsung or a completely different chipset (e.g., Snapdragon 888 on Galaxy S21), you will hard brick your device. The partition map differs entirely. efs-fix-regalstreak.tar.md5
This means your EFS partition is physically damaged (bad NAND block) or you have a different corruption type (e.g., QCN corruption on Qualcomm). Try a tool like QPST (Qualcomm Product Support Tool) to write a new QCN file instead.
Right-click Odin.exe > "Run as administrator." You should see a blue box under "ID:COM" when your phone is connected in Download Mode. Before understanding the fix, we must understand the problem
Search for efs-fix-regalstreak.tar.md5 on XDA forums or reputable Android file hosts (AndroidFileHost). Ensure the MD5 hash matches to avoid a corrupted download. The file size is typically around 8–15 MB.
The generic IMEI may be blacklisted by your carrier. This is why restoring your original IMEI is mandatory. Contact a professional repair shop with a JTAG or ISP programmer. What corrupts the EFS partition
Before resorting to efs-fix-regalstreak.tar.md5, try these less risky solutions: