Huawei S7721u Recovery Image Verify Failed Repack Patched

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:

4.1 Via TFTP from U-Boot

Interrupt the boot process (press Ctrl+C or f during countdown). At the HI_SILICON_V000# prompt:

# Set network parameters
setenv ipaddr 192.168.1.10
setenv serverip 192.168.1.100
setenv netmask 255.255.255.0
3.2 Analyze the Verification Mechanism
binwalk recovery_stock.img
# Look for: signature footer, RSA keys, or CRC32 at end

Common locations:

Last 256/512 bytes – RSA signature
Offset 0x200 – header with hash

Use hexdump to inspect:
hexdump -C recovery_stock.img | tail -n 32

Huawei S7721U: Fixing "Recovery Image Verify Failed" via Repack
If you are attempting to flash a Huawei S7721U device and encountering the dreaded "Recovery Image Verify Failed" error, you are likely dealing with signature mismatch issues or corrupted partition headers. This error typically occurs when the bootloader rejects the recovery image because it does not match the expected cryptographic signature or the file structure is invalid.
This guide explains why this happens and provides a technical walkthrough on how to "repack" a working image to bypass or fix this verification failure.

5. Seek Professional Help

If you're not comfortable with these processes or if you're dealing with a device that's critical for your operations, consider seeking help from a professional or Huawei support. Incorrectly updating or modifying device firmware can brick the device, making it unusable.

4.2 Via UART (XMODEM) if TFTP fails
In U-Boot:
loadb 0x80800000

Use your terminal software (PuTTY/Tera Term) to send the file via XMODEM/CRC. Then write to NAND as above.
Erase recovery partition (check mtd ID: mtd2 or mtd3)
nand erase 0x200000 0x800000   # Adjust offset and size
1. Executive Summary
When attempting to restore a Huawei S7721U switch using a modified or "repacked" recovery image (typically via TFTP or the Bootloader menu), the device halts the process reporting a verification failure. This is a security mechanism designed to prevent the execution of unauthorized firmware. huawei s7721u recovery image verify failed repack
This paper outlines the root cause of the verification check and provides the specific methodologies required to successfully flash a repacked image.
3.4 Modify Recovery Contents
Mount & edit:
mkdir /mnt/recovery
sudo mount -o loop recovery_nosig.img /mnt/recovery
# Replace files, add scripts, etc.
sudo umount /mnt/recovery