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CC2650STK: SensorTag CC2650 Suddenly stopped working after factory reset attempt (Same thing happened on 2 devices)

Part Number: CC2650STK
Other Parts Discussed in Thread: CC2541, CC2650, LAUNCHXL-CC2650, CC-DEVPACK-DEBUG, BLE-STACK,

Hello,

I've really enjoyed using the CC2650 SensorTags to test and design my system. However we have gone through multiple CC2541 models and now are on our third CC2650 model.

Twice on two different devices, the following scenario has resulted in the SensorTags (2650) no longer working, after only 2 weeks of moderate use.

1. The device begins sampling at a 1Hz rate even though the program asks it for a 10Hz rate. Multiple program and device restarts are made to try to resolve the issue.

2. The device begins flashing the red LED upon each disconnect from the master.

3. An attempt is made to reset the device to factory settings by holding both of the side buttons for 6 seconds. As a result, the red LED flashes.

4. As soon as factory reset attempt is complete and the red LED flashes, the device no longer has any activity.

On the problem devices, neither changing the battery nor attempting to do another factor reset by holding the side buttons incurs any LED activity.

I do have a CC-DEVPACK-DEBUG as well as a LAUNCHXL-CC2650, and have read somewhere that I may be able to fix the issue by attempting to re-flash the device. Can someone please direct me to a very clear resource for the process of using this equipment to hopefully resolve the issue?

Thanks