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Oregon 450 not detecting GSC-10 Cadence Sensor- Forerunner 310XT does...

Last summer, I used to ride with an Oregon 450 and had no problems connecting it to either my ANT+ heart rate monitor or my GSC-10 speed/cadence sensor. This spring, the GSC-10 is not detected by the Oregon while the HR monitor is.

I know the GSC-10 is working since it is detected by my Forerunner 310XT. Could it be the software update I did last winter (to 6.something)? If so, where can I find older software versions and what is the procedure to "downgrade"?