This is a checksum protection trigger. You flashed a modified (patched) "top" firmware that was not signed by Huawei. You need to disable signature verification via a serial console, or flash a stock signed firmware immediately to stop the boot loop.
: Log in to the router's web interface (typically at 192.168.8.1 ), click on More Functions in the top right, then select Manage Updates > Update Now . huawei b311221 firmware download top
Software & Firmware Download of Enterprise Products - Huawei This is a checksum protection trigger
: Flashing non-official firmware can "brick" your device. Always ensure you have a backup of your original NVRAM and firmware before proceeding. 4. Troubleshooting: Factory Reset huawei b311221 firmware download top