Hi there,
Yep roll back the board support package , the 2.9.1 doesn’t work
If you follow the threads you’ll see more.
Always, when-ever a known demo that should work, doesn’t, it’s always the BSP , LOL
that breaks them.
I prefer the mbed , but the power savings is way better if you use non-mbed.
Seeed needs to circle this square.
HTH
GL 
PJ
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