Huawei S7721u Recovery Image Verify Failed Repack Page

Use binwalk to find the SquashFS start offset:

binwalk original_recovery.img

Output example:

DECIMAL       HEXADECIMAL     DESCRIPTION
0             0x0             U-Boot uImage header
64            0x40            LZMA compressed data
262144        0x40000         Squashfs filesystem

Extract the SquashFS part:

dd if=original_recovery.img of=recovery.squashfs bs=1 skip=262144

Mount it (or use unsquashfs):

sudo mount -t squashfs -o loop recovery.squashfs /mnt/recovery
# Or:
unsquashfs -d recovery_root recovery.squashfs

Now modify the contents. Common fixes:

  • Background / device specifics

  • Why "verify failed" happens (causes)

  • Diagnostics — how to identify root cause

  • Repack workflow (safe, step-by-step)

  • Inspect and modify contents (if editing):
  • Repack steps:
  • Re-signing (if stock locked bootloader requires signed images):
  • Final verification locally: confirm file hash, run verification tools (if any), test in fastboot (fastboot flash recovery then reboot recovery).

  • Common mistakes and how to avoid them

  • Recovery strategies when verify fails and you cannot re-sign

  • Example troubleshooting walk-through (concise)

  • Safety, legal, and warranty notes

  • Resources and tools (brief list)

    • Users repack the firmware to:

    If you'd like, I can start by writing the full feature article now — confirm to proceed.

    The Huawei S7-721u (often referred to as the MediaPad 7 Youth 2) frequently encounters the "Recovery Image Verify Failed" error during firmware repacking or custom flashing due to strict digital signature checks in the bootloader. When you "repack" a recovery image, you are essentially modifying it, which breaks the original security signature and causes the verification failure. Core Problem: Why Repacking Fails huawei s7721u recovery image verify failed repack

    The bootloader on the S7-721u is designed to verify the integrity of the recovery partition before allowing it to boot.

    Signature Mismatch: A repacked image lacks the official Huawei private key signature.

    Corrupted Headers: If the repacking tool does not correctly format the image headers for this specific device, the bootloader will reject it as corrupted. Verified Solutions & Troubleshooting

    If you are stuck in a loop because of a failed repack, you must restore the original official images to bypass the verification check. Restore Official Recovery:

    Use Huawei Update Extractor to pull the original recovery.img from an official firmware (UPDATE.APP) file.

    Flash this original image via Fastboot mode: fastboot flash recovery recovery.img. eRecovery Method (Wi-Fi Restore): Connect the device to a power source or PC via USB.

    Hold Volume Up + Power for ~15 seconds until the eRecovery screen appears. Select Download latest version and recovery.

    Connect to Wi-Fi; the device will automatically pull the correct, signed recovery and firmware directly from Huawei's servers. SD Card Method (dload): Format a different SD card to FAT32. Use binwalk to find the SquashFS start offset:

    Create a folder named dload in the root directory and place the original UPDATE.APP inside.

    Power off, then hold Volume Up + Volume Down + Power simultaneously to trigger the force update, which ignores standard software checks to overwrite the corrupted partitions. Critical Precaution

    Avoid using "generic" repacking tools for this specific MediaPad model, as it requires exact alignment of the boot and recovery headers. If the verification continues to fail even with official files, it may indicate a hardware issue with the internal EMMC storage or the charging board causing a short.

    Do you have the original firmware file for your specific region, or should I help you find the correct UPDATE.APP for the S7-721u? How to Fix Huawei Recovery Image Verify Failed Error

    The mention of "repack" suggests you might be looking into re-packaging or re-flashing the firmware or recovery image to resolve the issue. Here are some general steps and considerations:

    The Huawei S7721U utilizes a secure boot chain (often based on U-Boot). The "verify failed" error occurs because the bootloader performs a checksum validation against a stored hash or digital signature.

    If you have "repacked" the image (e.g., extracted the filesystem, modified files, and repacked it), the internal checksums (MD5/SHA256) within the image header no longer match the actual file content.

    There are two distinct scenarios for this failure: Output example: DECIMAL HEXADECIMAL DESCRIPTION 0 0x0 U-Boot