Huawei generally reserves "local update" packages for service centers, so official .bin or .zip files aren't typically provided for public download. If you have specific enterprise access, you can find official patches at the Huawei Support Enterprise Portal. Firmware Version Specs Huawei B311-221 Firmware Release Notes | PDF - Scribd
To update the firmware of your Huawei B311-221 Go to product viewer dialog for this item. huawei b311-221 firmware download
This is the most common error. It usually means you are trying to install a firmware version older than the one currently on the device, or the region of the firmware does not match the device hardware. Double-check your Hardware Version (Ver. A vs Ver. B) and ensure the file is newer than your current build. This is the most common error