Launch your PC's command terminal inside your platform-tools folder and execute the recovery flashing string: fastboot flash recovery RECOVERY.img Use code with caution. Reboot the system cleanly: fastboot reboot Use code with caution. Step 2: The SD Card Force-Update Method (dload Mode)

The (likely a Huawei ONT/router) uses signature verification for its recovery image ( recovery.img ). When you flash a modified or unofficial image, you see:

When attempting to recover or upgrade the Huawei S7721U switch, the device may display a "verify failed" error message. This typically occurs when the recovery image fails to pass the verification process, preventing the switch from booting or upgrading successfully. The error can be caused by various factors, including:

To avoid "recovery image verify failed" on the S7721U-HI in the future: Always use official Huawei software updates. Always verify the CRC/hash of the file. Use sftp for file transfers.

The error message "recovery image verify failed" on a Huawei device (such as the

This will bypass the "verify failed" loop if you are using an official, unmodified firmware file. Troubleshooting Repack Failures If you are attempting to

⚠️ This guide is for educational purposes only. Modifying firmware may void warranties, brick the device, or violate terms of service. Proceed at your own risk.

to verify you are using the correct partition headers. Repacking without resigned partitions typically results in a brick or a verification loop. Quick Recovery Checklist SD Card Compatibility

The tool must generate a new CRC32 checksum for the package.