Ordinarily, once you have updated the user interface app on your phone to 5.0, then a button should appear under Settings>Device Information. Pushing the button should activate the download of the 1.1.8 firmware via Bluetooth to your goTenna mesh unit.
Your serial number is not in the AA12341234 group, so the update should work, but since an Android is involved, things are sometimes still a little more complicated. Check Virginia’s recent message for more detail, then drop her a line if that doesn’t resolve things.
Note this is not because Android is “bad” or that iPhone js “better.” The ecosystems are just different. Apple keeps everything in line under one roof, it’s own rules govern and are uniformly applied.
With Android, every mfg takes the basic functionality, then implements it how they see fit. Samsung is particularly notorious in this regard. Since there are probably hundreds of different “flavors” of Android, goTenna tries to cover them all. Testing all is probably beyond anyone’s capacity. So there’s a certain amount of “user testing” inherent in almost anyone’s Android updates, because some things slip through because of the lack of “central management” of Android like Apple does with the iOS. What counts is how responsive goTenna is in following up addressing the irritations are they come up in use.
Yes, when many people contribute to the discussion, if can diverge and fork, but its also useful. Your problem is not someone else’s problems and they all must be covered. There’s isn’t a single concise solution here, as the problems involved vary.