EM9191 4x4 MIMO

I mean your customer will not frequently change the number of antenna, right?

When they receive your product, they might just need to change the setting once

Yes, that is the typical case, no frequent changes. But it bothers us that we were told not to touch RFCID on field at all. That makes you think that even the first change might lead to problems…

No idea, i don’t quite see any user doing stress test on this kind of antenna setup

You might do some more test to verify.