Huawei S7721u Recovery Image Verify Failed Repack ^hot^ -

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: huawei s7721u recovery image verify failed repack

Remember: Always verify your repacked image on a test device before deploying to production. And when in doubt, source the original firmware from Huawei’s enterprise support portal (requires valid contract). binwalk original_recovery

00000000 48 55 41 57 45 49 00 01 00 00 1c 20 00 00 00 10 |HUAWEI..... ....| The first 4 bytes ( HUAW or NAND ) define the image type. If you repack without preserving this, verification fails. 3.4 Mounting and Modifying the Recovery Image Use binwalk to find the SquashFS start offset: When this happens, the device refuses to boot

This message signals a fatal checksum or signature mismatch during the bootloader’s integrity check. When this happens, the device refuses to boot the main firmware, drops into a recovery shell (often BusyBox), or enters an infinite reboot loop. Without intervention, the S7721U becomes a brick.

# Set network parameters setenv ipaddr 192.168.1.10 setenv serverip 192.168.1.100 setenv netmask 255.255.255.0 tftp 0x80800000 repacked_recovery.img Erase recovery partition (check mtd ID: mtd2 or mtd3) nand erase 0x200000 0x800000 # Adjust offset and size Write to NAND nand write 0x80800000 0x200000 0x800000 Reset reset 4.2 Via UART (XMODEM) if TFTP fails In U-Boot: