nRF52 DK v1.2.x

Interface MCU firmware

The onboard interface MCU is factory programmed with an mbed-compliant bootloader. This feature makes it possible to swap interface firmware between the factory preloaded SEGGER J-Link OB and the mbed interface firmware.

See section IF Boot/Reset button on how to enter the bootloader.

To swap interface MCU firmware, simply drag the Interface image (.bin) into the mounted bootloader drive on the connected computer and power cycle the DK.

Both the mbed interface firmware and the J-Link OB image can be downloaded from