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SensorTag 2.0 can't connect with Android App

Other Parts Discussed in Thread: CC2640, CC2540

Hello fellows engineers,

I am developing with a SensorTag 2.0. At the beginning the SensorTag was connecting normally with the Android App. Then I performed some tests with SensorTag with CCS. I connected the SensorTag using the Dev Kit and Debugged the SensorTagStack then SensorTag projects in order to test the connection with the CCS. 

After I have preformed those tests I cannot connect the SensorTag with my Android App anymore. I can find the SensorTag on the phone then, when I click to connect, the app displays the loading screen "Generating GUI", then "Enabling Services" and then it fails to complete and show the message "Unfortunately, BLE SensorTag has stopped"

I have tried to download again the firmware to the sensor tag, but the problem persists. I have tried on a Nexus 4 and Nexus 5.

I don't know what else I can do. The firmwares seems to be working since it can be recognized by the Bluetooth. Is this some problem on the phone or app configuration?

Thank you