Problem with uploading with nRFgo

[anilkunchalaece]

Hi, i am trying to upload the code to BLE 400 from waveshare from nrfGo by getting the hex file from this library

While Trying to upload the code i am getting the following error

How to avoid this error??

[bjorn-spockeli]

Do you want to flash the .hex file or do you want to update the firmware on your BLE400 through a serial firmware update? If its the latter themn have you flahed a serial bootloader to your BLE400 board?