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Coordinator node can not start up a network

I tried to test the sensor demo code with zigbee sensor monitor, the following is my steps and observations:

1. I downloaded collectorEB firmware using IAR debug function. After it I can see led 1-3 are blinking.

2. I push joystick up to set it to be a cooridnator, but all led 1-3 stil blinking (is it expected?).

3. I push joystick right. Now I can see the red led switch between on/off, and the LCD switch between gateway mode/collector. However, the green led is still blink! I believe it means the network didn't get set up by this coordinator.

After tracing into code, I found that "zb_StartConfirm" in the DemoCollector.c NEVER get called. In addition, after pushing joystick up and system reset, the "ZCD_NV_LOGICAL_TYPE" from NV is still ZG_DEVICETYPE_ROUTER, instead of ZG_DEVICETYPE_COORDINATOR as expected.

Finally, from sensor monitor I can see a single SINK RX, no other node even after programing more nodes.

I would appreciate any help!

Alex