Turn off the device and connect it to a power source or PC via USB.
Example troubleshooting walk-through (concise)
Compare the size of the uploaded .cc file on the switch with the file on your computer. huawei s7721u recovery image verify failed repack
Use hexdump to inspect:
fastboot reboot recovery
When utilizing tools such as mkbootimg , you must explicitly pass the original Qualcomm offsets. For the Huawei S7-721u , use these standard parameters during compilation: : 0x00008000 Ramdisk Offset : 0x01000000 Tags Offset : 0x00000100 Page Size : 2048 2. Retain the Original Signature Footer
truncate -s 8M repacked_recovery.img
One of the most terrifying errors an engineer can face on the serial console is:
fastboot flash recovery recovery.img
Before attempting a fix, it is crucial to understand why the verification fails. The Huawei S7721U, like most modern Android devices, enforces strict security protocols.
This is the most reliable, non-invasive fix. It completely rewrites all system partitions—including boot, recovery, and system images—with the authorized factory versions. Turn off the device and connect it to