Press and hold (older models may also require the Home button).
| Step | Byte | XOR result | +1 (mod 256) | |------|------|------------|---------------| | 0 | – | 0 | – | | 1 | 0x12 | 0x12 | 0x13 | | 2 | 0x34 | 0x27 (0x13⊕0x34) | 0x28 | | 3 | 0x56 | 0x7E (0x28⊕0x56) | 0x7F | | 4 | 0x78 | 0x07 (0x7F⊕0x78) | 0x08 | samsung binary check code
Before diving into fixes, you need to understand why Samsung implemented this. The binary check is part of the and VaultKeeper security. Once you upgrade your phone to a newer bootloader version (e.g., v5 to v6), you can never go back. This prevents hackers from downgrading your OS to an older, vulnerable version to exploit security holes. Press and hold (older models may also require
Your phone is on binary 5, but you are trying to install binary 2. Result: The flash will fail instantly in Odin. "Custom Binary Blocked by FRP Lock" Once you upgrade your phone to a newer bootloader version (e