Forerunner 920XT 英文正式版固件更新至 6.20

暂未提供固件下载，有需要的童鞋请给我留言。

更新日志

Changes made from version 6.10 to 6.20:

• Added support for the latest running dynamics. These include: Ground Contact Time Balance, Stride Length, and Vertical Ratio (requires a new HRM-Run, the original HRM-Run with sw ver 6.60, or HRM-Tri with sw ver 4.20).
• Improved average stride length calculation.