The following is the location of the firmware which you will need to download. Please use the SAVE AS option (or the equivalent for your operating system).
https://the5krunner.com/wp-content/uploads/2013/06/garmin-firmware-2-60-revert-back-from-2-70.jpg
You need to download and then rename it to a .zip file as wordpress won’t let me host .zip files. But it is the right one really, honest! Don’t do it if you don’t believe me. Alternatively you can get the same files and instructions from: Social.Support@garmin.com
After downloading and renaming to .zip follow these instructions:
For PC:
1. Navigate to this folder location:
a. Windows XP: C:\Documents and Settings\User account name\Application Data\GARMIN\Devices\numbered Unit ID folder
b. Windows Vista / 7 / 8: C:\Users\User account name\AppData\Roaming\GARMIN\Devices\numbered Unit ID folder
2. Unzip or drag and drop the files inside attachment to location above
3. Close windows explorer
4. Open Garmin ANT Agent
5. Turn On Forerunner 910XT and bring within range of the ANT stick
6. ANT Agent will transfer software to device
For Mac OS:
1. Navigate to ~user/Library1/Application Support/Garmin/Devices/numbered Unit ID folder/
2. Unzip or drag and drop the files inside attachment to location above
3. Open Garmin ANT Agent
4. Turn On Forerunner 910XT and bring within range of the ANT stick
5. ANT Agent will transfer software to device
1On Mac OS 10.6 and higher: the Library folder is hidden. To get to Library:
1. Open Finder
2. Click Go in the top menu bar
3. Click Home
4. Click Go in the top menu bar
5. Click Go to Folder…
6. Type Library
7. Click Go