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"error 2 signifies that the calibration timed out because there was too much movement or changes in load throughout the calibration attempt (the bike should be stationary and upright, with no load on the pedals). It is possible to get this error because of a problem in firmware versions older than the current 3.90 release. If your firmware version is older, then use Vector Updater (with new or very recent batteries) or your Edge to update the firmware to 3.90."