Hi alszhao, did you ever get hold of one in the end? I am also based in HK, they only seem to have H versions here, I can get hold of an E3372H-320, but would like to get it to convert it to just the Stick Modem version (22.x→22.1x firmware), as I have an E8732H-153 which I do not want to convert.
k.
Versions are shown here https://store4g.com/blog/huawei-e3372-vs-e8372/