diff -ur a/plugins/huawei/77-mm-huawei-net-port-types.rules b/plugins/huawei/77-mm-huawei-net-port-types.rules
--- a/plugins/huawei/77-mm-huawei-net-port-types.rules
+++ b/plugins/huawei/77-mm-huawei-net-port-types.rules
@@ -8,9 +8,13 @@
 SUBSYSTEMS=="usb", ATTRS{bInterfaceClass}=="ff", ATTRS{bInterfaceSubClass}=="01", ATTRS{bInterfaceProtocol}=="02", ENV{ID_MM_HUAWEI_AT_PORT}="1"
 SUBSYSTEMS=="usb", ATTRS{bInterfaceClass}=="ff", ATTRS{bInterfaceSubClass}=="02", ATTRS{bInterfaceProtocol}=="01", ENV{ID_MM_HUAWEI_MODEM_PORT}="1"
 SUBSYSTEMS=="usb", ATTRS{bInterfaceClass}=="ff", ATTRS{bInterfaceSubClass}=="02", ATTRS{bInterfaceProtocol}=="02", ENV{ID_MM_HUAWEI_AT_PORT}="1"
+# Huawei E3276 firmware 21.192.13.00.00
+SUBSYSTEMS=="usb", ATTRS{bInterfaceClass}=="ff", ATTRS{bInterfaceSubClass}=="02", ATTRS{bInterfaceProtocol}=="12", ENV{ID_MM_HUAWEI_AT_PORT}="1"
 
 # Only the standard ECM or NCM port can support dial-up with AT NDISDUP through AT port
 SUBSYSTEMS=="usb", ATTRS{bInterfaceClass}=="02", ATTRS{bInterfaceSubClass}=="06",ATTRS{bInterfaceProtocol}=="00", ENV{ID_MM_HUAWEI_NDISDUP_SUPPORTED}="1"
 SUBSYSTEMS=="usb", ATTRS{bInterfaceClass}=="02", ATTRS{bInterfaceSubClass}=="0d",ATTRS{bInterfaceProtocol}=="00", ENV{ID_MM_HUAWEI_NDISDUP_SUPPORTED}="1"
+# Huawei E3276 firmware 21.192.13.00.00
+SUBSYSTEMS=="usb", ATTRS{bInterfaceClass}=="ff", ATTRS{bInterfaceSubClass}=="02",ATTRS{bInterfaceProtocol}=="16", ENV{ID_MM_HUAWEI_NDISDUP_SUPPORTED}="1"
 
 LABEL="mm_huawei_port_types_end"