Hi,
@Peter03 , I've not been following the upgrade thing too much as I use libre with a miaomiao transmitter and xDrip+ so really just use the reader to start the sensor, but one thing which I've noticed is that if you've got an active sensor running, on, say, day 7 or whatever, if you upgrade the reader then it seems not to be able to read the sensor, so probably best to wait till next sensor change, and activate it with the upgrade. Could be wrong on this but that seems to be the message coming across from upgraders.
The other thing which is happening is that Abbott have been "batch calibrating" sensors - make a big batch, pull a few, calibrate them against a known glucose quantity, apply that calibration to the whole batch - whereas with libre version 2, out in Germany, not here yet, they're calibrating each individually - there's been some speculation that they're already doing that just now on version 1 as a test run, but no-one knows for sure. The hopes are that individual cal will tighten up the sketchy ones, but we must wait and see.