To unlock your Huawei B311-221 router, you can either use an official IMEI-based unlock code or flash a modified firmware. Be aware that flashing custom firmware is risky and may void your warranty or brick the device if not done correctly. DirectUnlocks Method 1: Standard Unlock (No Firmware Change)
If you still want to try unofficial methods: b311221 unlock firmware link
Yes. Any non-official firmware voids the manufacturer warranty. However, carrier locks are separate – unlocking via code does not void warranty. To unlock your Huawei B311-221 router, you can
Instead of changing the firmware, you can buy an "Unlock Code" (NCK) based on your device's IMEI. This is safer because it doesn't involve hacking the internal software. To unlock your Huawei B311-221 router