OpenRTK Android app does not find EVK / Bluetooth connection does not work

I followed the instruction on https://openrtk.readthedocs.io/en/latest/useOpenRTK/Go-Mobile.html
In the step
"Open the “OpenRTK” Andorid App, as shown by the picture below, go to the “Connect” tab and click the “search” icon (right bottom) to search for your device."
There phone does not find the EVK.
I tried flashing to the factory original firmware, it cannot be found. The android phone has Bluetooth turned on. I can find other previously used BT devices.

@zhihengcao Make sure the phone has location information and Bluetooth enabled,please.

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