@vagabondo "download the firmware"???
Firmware is programming that's written to the read-only memory (ROM) of a computing device.
ROM is "built-in" computer memory containing data that normally can only be read, not written to.
PROM is read-only memory (ROM) that can be modified once by a user. (not sure about the once anymore)
You could download software that could perhaps fix the problem.
Or if that device had the means to "burn" a PROM and it is a PROM then you could do that, but I am sure there is no such possibility.
You could perhaps also pull it/them out and replace with what the factory sends you.
Not an expert, must be some 30 years since I played with stuff like that, very much a part of IT and programming then, and fun.
My point is however this "Short of a fix, Trend recommends replacing vulnerable devices"..
And perhaps it will be like this:
If those sold in the USA came from any ISP then I think they should replace the whole damned thing.