If the device is stuck in the bootloader, you must perform a clean installation.
: Unzip the downloaded file on a computer. Locate the dload folder, which must contain the massive UPDATE.APP binary file. huawei s7721u recovery image verify failed repack
Attempting to install a version incompatible with the current hardware or VRP (Versatile Routing Platform) version. If the device is stuck in the bootloader,
FirmwareEditor - pack -o repacked_recovery.img modify DTB or bootloader env:
to let the tool automatically find and flash the correct official firmware. Attempt eRecovery Restore
Access UART or JTAG, halt boot, modify DTB or bootloader env: