during the update; this can permanently brick the device.
to allow the router to install new firmware automatically during idle hours (typically 3:00 AM – 5:00 AM). HUAWEI Global Important Pre-Update Checklist Power Supply: huawei b311221 firmware download top
Huawei devices use a specific naming convention. Knowing yours helps in finding the correct "dump" or "firmware" online: : B311-221 Firmware Format : Usually looks like 10.x.x.x(HxxxSPxxx) Customization during the update; this can permanently brick the device