bt_hci_driver: Endpoint binding failed with -11

[YAZHINI]

<err> bt_hci_driver: Endpoint binding failed with -11
[00:00:01.435,913] <err> bt_hci_core: HCI driver open failed (-11)
[00:00:01.435,913] <err> mpu6050_ble: Bluetooth init failed

[Hung Bui]

Hi Yazhini, 
Have you made sure you flashed the netcore with the BLE stack ? 
By default it's automatically compiled with the ble application and will be flashed automatically when you flash the app core. But if you have your own board file, there is a chance that it's not flashed with the application. 

My suggestion is to try compiling a default BLE sample (you can use the DK board) and flash it on your board to test.