If your config.bin starts with SEND or ZTE in hex ( 53 45 4E 44 ), it’s likely XOR-obfuscated:
Older ZTE routers (e.g., ZXDSL 831 series, early F660) used a simplistic obfuscation method: XOR encryption with a static 16-byte key. This is not real encryption; it’s a reversible transform. The key was discovered through reverse engineering and is widely published. Decrypt Zte Config.bin
This is painstaking but has been done successfully for models like the F609. If your config
This write-up covers what a ZTE config.bin file typically is, why someone might want to decrypt it, legal/ethical considerations, and a practical, reproducible method to extract and decrypt configuration contents (passwords, settings, firmware info). It assumes you have a legitimate reason and authorization to examine the device/config (owner, admin, or explicit consent). I do not assist with bypassing security on devices you do not own or have permission to access. This is painstaking but has been done successfully
For most modern ZTE routers (like the ZXHN H298A, F660, or F670L), follow these steps to use the ZCU tool:
