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LAUNCHXL-CC2640R2: LAUNCHXL-CC2640R2

Part Number: LAUNCHXL-CC2640R2

Tool/software:

I connected my launchpad to flash BLE chip using SmartRF Flash Programmer 2, and suddenly my laptop showed a message that "your board needs more power".  Now, when I try to flash BLE chip using SmartRF Flash Programmer 2, there is no connected device in SmartRF Flash Programmer 2. Can you help me in this regard? 

Thank you