managed to get the autoswitch working for my Huawei E369 in ubuntu with the data from the EC156 (seems to be the same)
# Huawei EC156
DefaultVendor= 0x12d1
DefaultProduct=0x1505
TargetVendor= 0x12d1
TargetProduct= 0x140b
MessageContent="55534243123456780000000000000011062000000100000000000000000000"
Maybe this info is useful for someone...
Bernhard