I have a similar story to Peter’s : I had great difficulty getting the download to run (it mostly got stuck ‘connecting’ or ‘autoconnecting’) and only got it to work when I saw Peter’s report and tried turning the BT off and on again.
The download then worked well, taking 2 minutes. But afterwards, the app wouldn’t believe the meter was back in normal mode despite the led indicating that it was. Again, cycling the BT in the phone setup allowed it to work.
It’s now mostly working, but I can confirm the problem Peter reports with buffer mode. It will refresh once or twice and then gets stuck.
Regarding downloads on Android devices : how about putting the update code on an SD card and installing it from there ? They’re much cheaper than an iOS phone !