I have an iPhone XR and recently updated to iOS 13 and the FOBO app would no longer communicate with the sensors. I tried everything I could think of, but no luck. After emailing back and forth with FOBO Support, this was their remedy:
Here are the steps that you will need to follow thoroughly:
1. Install FOBO Bike App on older iOS version (iOS 12 or lower).
2. Login using the same account.
3. Install the sensors.
4. Upgrade firmware for all the sensors. Select the option on the menu drop down and follow the instructions carefully.
5. Upon successful all the above, wait for at least 10 – 15 minutes in order for the data to sync properly in the server with good internet connection.
After doing the above, go back to your iPhone Xr:
1. Delete any FOBO Bike App.
2. Download FOBO Bike 2 App.
3. Login using the same credential with good internet connection.
4. The data of the sensors will be transferred automatically.
5. Do not go back to older FOBO Bike App and continue using FOBO Bike 2 App.
I had an old iPad that had not updated to the new iOS and followed the steps precisely, and after about 30 minutes of tinkering, everything is working fine, including the battery indicator issue.
If you haven’t upgraded the firmware, that might take care of the battery issue for you too.