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CC2538DK: How to activate the MCU's internal bootloader?

Part Number: CC2538DK
Other Parts Discussed in Thread: CC2538

Hello,

I'm trying to install the RIOT system on to the CC2538DK. But I couldn't flash the firmware into the board. According to the RIOT instruction, I need to hold down the SELECT pushbutton while pressing RESET to activate the MCU's internal bootloader. I did that but nothing happened. So I was not sure about whether I have successfully activated bootloader or not. Is there any method to check that out?

Thanks so much in advance.