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CC2650: Debugging unable to ON after reset

Part Number: CC2650

I have a CC2650 that starts to blink red led on start up recently. After using a reset(by pressing buttons on both sides), the sensortag seems to be unable to start up now(no response). I have tried to change a new battery but it did not helped. Can anyone guide me on how to solve this step by step as i am fairly new to it. I have a debugger devpack if it helps.