: If the firmware is updated but the SIM still doesn't work, you may need to manually configure the APN settings for your new carrier under Network Settings . If you'd like to proceed, let me know: What is your current firmware version ? Are you comfortable opening the router case? Which carrier is the device currently locked to? How do I update the firmware version of my HUAWEI router

: Some community tools, like the B311-221 Chrome Extension , provide a developer interface to help manage or potentially bypass certain UI restrictions. Step-by-Step Unlock Procedure (Code Method)