is the international Exynos-based variant of the Galaxy S7. By the time it reached Android 8.0 Oreo with binary version U7, Samsung had significantly tightened security.
with binary version (bit 7) running Android 8.0 Oreo represents the final official software stage for this classic device. Rooting this specific configuration requires precise tools due to the security restrictions inherent in later binary versions like U7. Understanding the SM-G930F U7 Environment Go to product viewer dialog for this item. is the international Exynos-based variant of the Galaxy S7
The "U7" in your firmware string refers to the binary version. Samsung prevents downgrading to firmware with a lower binary number, meaning once you are on U7, you cannot use older U1-U6 root files. meaning once you are on U7