Failed Repack [extra Quality] - Huawei S7721u Recovery Image Verify

If they do not match, re-download the firmware from the official Huawei Support site. 2. Format the Storage Media (SD Card/USB)

Select in HiSuite and follow the prompts to download authorized images.

| Symptom | Likely Cause | Solution | |---------|--------------|----------| | CRC error after repack | Wrong offset or algorithm | Dump stock CRC location with IDA/Ghidra | | Signature mismatch | RSA‑2048 with Huawei private key | Patch bootloader or use known vulnerable version | | Bootloop after flash | Modified init scripts | Re‑extract stock, make minimal changes | | Fastboot not available | Bootloader locked | Unlock via vendor code or UART commands | huawei s7721u recovery image verify failed repack

The .cc (or .pat ) file was opened, modified, and re-packed without the original Huawei cryptographic keys.

Using flash memory with corrupted sectors. If they do not match, re-download the firmware

fastboot flash recovery recovery.img

Right-click on and select Extract Selected . Save it to an isolated directory named /workspace . Phase 2: Unpacking the Recovery Image | Symptom | Likely Cause | Solution |

If RSA‑signed (common on Huawei):