According to the published release notes , the B311-221 firmware version 10.0.1.1 includes:

This is the standard, safest method using the router’s built-in administration page.

If automatic updates fail or you want to manually update using a file, use the :

If your carrier has locked your router and you are looking for free third-party firmware to unlock it, you need to be aware of the following risks:

Open a web browser and type 192.168.8.1 (or the IP listed on the sticker under the router). Login: Log in with your password. Update: Navigate to More Functions > System > Update . Check: Click "Check for Updates" and install if available. Troubleshooting Huawei B311-221 Firmware Issues If your router is failing to update, try the following:

If your router is stuck in a boot loop (flashing power light), reinstalling the stock firmware can fix it.

Enhanced 4G data throughput and more stable Wi-Fi connections.

A solid red light usually indicates no network connection, but if it happens immediately after a firmware flash, the device may be semi-bricked. Try re-flashing the firmware using the Multicast Upgrade Tool over an Ethernet cable.

For those searching for firmware solely to change SIM cards, the solution is rarely a firmware flash. The industry standard for the B311-221 is an .