Seems others are reporting similar issues. The suggestion of deleting the device from bluetooth, clearing cache, then re-pairing does not work for me. Since updating to 2.13.0.1, my Fenix 2 pairs just fine, connects, the app shows the sync is in-progress, but it never progresses beyond a very small amount before erroring out saying the sync was not successful and prompting me to retry. This is happening on a Verizon S5, fully up-to-date.