If an update goes wrong, you can restore factory settings by holding the button with a needle for about 10 seconds. VoIP Setup:
If you bought your B311-221 from a network carrier (e.g., locked to Vodafone, MTN, or Telstra), it will not accept SIM cards from other providers. To make it truly portable (usable with any local SIM while traveling), it must be unlocked. huawei b311221 firmware portable
), you can use the web-based management interface or the mobile app. If an update goes wrong, you can restore
Example filename: Huawei_B311-221_VER.B_Portable_Band_Lock_v3.bin (size ~35 MB) If an update goes wrong