Failed Repack [repack] — Huawei S7721u Recovery Image Verify

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

Reconstruction and Signature Recalculation: This is the crucial step. After repacking the filesystem (e.g., mksquashfs), the engineer reconstructs the raw recovery image: header + kernel + initramfs + device tree. However, without Huawei’s private key, a valid RSA signature cannot be generated. Therefore, the engineer must leverage one of two legitimate strategies: huawei s7721u recovery image verify failed repack

If your device is stuck due to a "verify failed" error after a repack attempt, you must restore it using authorized official images. 1. Official SD Card Update (Force Upgrade) The error message "recovery image verify failed" on

  • Windows: certutil -hashfile recovery_stock.img SHA256
  • Linux/Mac: sha256sum recovery_stock.img
  1. Download Android Image Kitchen (AIK).
  2. Drag and drop your recovery.img into unpackimg.bat.
  3. Navigate to the extracted folder and look for the ramdisk folder.
  4. (Advanced) Locate the default.prop or fstab file and modify ro secure boot properties (only if you know what you are doing).
  5. Run repackimg.bat. This creates a new image-new.img.
  6. Rename this to recovery.img.

Create a folder named dload on a FAT32-formatted SD card and copy the UPDATE.APP file into it. Windows: certutil -hashfile recovery_stock