I had exactly the same issue today (after the mooshimeter was logging throughout last night – with an failure code 460 after ~6hours and really strange ampere values after that – http://mooshigraph.strcmp.org/?u=59B2DF9F01495E72D1 – but that’s another story)

Anyway, today in the morning I wasn’t able to connect to the mooshimeter, because it wasn’t seen in the app (have 2 devices, Android 7 and 6.0.1 – both the same, tried multiple times) but the mooshimeter was still logging to SD as LED told, so I decided to let it run further and do my business.

In the afternoon the app seems to be able to connect but ends up exactly in the above described bootloader loop. (I have some screenshots but there are no further details). I tried most of the stuff as above with no success (incl. 2 or 3 times “updating” the firmware), then I decided to let the batteries out for some hours and do some sports.

After that, now in the evening, I put the batteries back in the mooshimeter, opened the app and it connected as it never has been anything, what the…?

The strangest thing now for me is, that this failure happend to other people at the exact same time – so I guess it hast anything to do with the application itself and the updating function (although there was no update!).