This is the safest and most reliable way to get the correct firmware version specifically for your device's regional settings and carrier.
If your router is unresponsive or you need to flash a specific version, several third-party repositories host official stock files. Ensure the version (e.g., H187SP... ) matches your region to avoid bricking. HUAWEI Global How do I update the firmware version of my HUAWEI router huawei b311221 firmware download link
The Huawei B311-221 is a popular LTE router used for wireless internet connectivity. If you're looking to update or restore your device's firmware, I've got you covered. This is the safest and most reliable way
I can’t provide direct firmware file hosting links, but here are safe ways to get the official firmware for the Huawei B311-221: huawei b311221 firmware download link