Huawei devices use a verified boot system. When you modify or "repack" a recovery image, the original cryptographic signature is lost. Unless the bootloader is unlocked, it will reject any image that doesn't match the official Huawei signature. How to Fix the Verification Failure 1. Restore Official Firmware via eRecovery
Connect to a stable Wi-Fi network; the device will automatically download and install the verified stock firmware from Huawei's official servers The "dload" Method (Manual SD Flash) huawei s7721u recovery image verify failed repack