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:
Release the buttons when the "Installing" screen appears. If successful, it will display "OK" upon completion. 2. Use Huawei HiSuite (System Restoration) huawei s7721u recovery image verify failed repack
The (often a distribution switch or ONT/CPE device) may encounter a “Recovery Image Verify Failed” error during firmware updates or recovery mode operations. This report explains the root cause, the security mechanism behind the failure, and the repack procedure required to bypass or correct the verification error. The (likely a Huawei ONT/router) uses signature verification
This will extract the contents of the recovery image, allowing you to analyze its structure and components. the security mechanism behind the failure