A user downloaded B311-221_UltimateSpeed.bin from a Telegram group. After installation, the router’s 4G upload speed dropped to 0.5 Mbps. Rolling back was impossible because the custom firmware corrupted the modem partition.
For the Huawei B311-221 Go to product viewer dialog for this item. huawei b311221 firmware verified
: He connected his laptop directly to the router's LAN port. : He logged into the 192.168.1.1 , his fingers flying across the keys. The Upload : He navigated to the Updates section , selected the verified firmware, and clicked "Upgrade". Verification A user downloaded B311-221_UltimateSpeed