Picked this one for having hassle free LTE internet that I would be able to flash it for the stick version where there is no NAT, the carrier assigned ip is directly exposed without restrictions. It has also very good compatibility with Linux.

I found this blog article where the firmware E3372h-153 21.180.01.00.00 is mentioned. All the links are dead and it's so difficult to find anything with Google now that every single piece of information is controlled.

Any idea where I could look to find this kind of files ?