Run offical mobilenet demo error

rpdzkj@rpdzkj:~/Desktop/rknn-toolkit-v1.30/rknn-toolkit-v1.30/examples/tflite/mo
bilenet_v1$ python3 test.py
--> config model
done
--> Loading model
done
--> Building model
done
--> Export RKNN model
done
--> Init runtime environment
E Only support ntb mode on ARM64 platform. But can not find device with ntb mode.
E Catch exception when init runtime!
E Traceback (most recent call last):
E   File "rknn/api/rknn_base.py", line 963, in rknn.api.rknn_base.RKNNBase.init_runtime
E   File "rknn/api/rknn_runtime.py", line 161, in rknn.api.rknn_runtime.RKNNRuntime.__init__
E   File "rknn/api/rknn_platform_utils.py", line 268, in rknn.api.rknn_platform_utils.start_ntp_or_adb
E Exception: Init runtime environment failed!
Init runtime environment failed

Do you run demo on Toybrick board? which board is it?
is the OS debian10?
The default user name on Toybrick boards is toybrick, do you change username on your boards?