The Huawei S7721U is a popular switch device used in various network infrastructures. However, users may encounter issues with the recovery image verification process, which can lead to a "verify failed" error. This article aims to provide a detailed guide on how to address this issue by repacking the recovery image.

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nand write 0x80800000 0x200000 0x800000

If the recovery image verification fails, the device may:

This is the trickiest part. You preserve the original header, CRC, and signature placeholders.