Edge board is unable to program

Hi all,

I’m testing the Edge Development Board now. I followed the instructions to program the example of LIS2DH12 Accelerometer UART. It shows the following message when programing. I’ve followed the instructions to enable the button and serial. How should I program it?

I got something confused. From the website, all examples programed through the bootloader over UART. When to used the J-link to program? How to make sure that the bootloader exist?

Connecting over serial port /dev/ttyUSB0…

Sending Hello.

No response for command 0x00000000

Failed to respond

Fail

Sending Hello.

No response for command 0x00000000

Failed to respond

Fail

Sending Hello.

No response for command 0x00000000

Failed to respond

Fail

Tries = 3