https://devzone.nordicsemi.com/f/nordic-q-a/28007/nrf52-dk-mbed-support-problemDear team, I bought a nRF52 DK which is labled &quot;PCA10040 V1.2.1 2017.21 xxxxxxxxx&quot;. xxxxxxxxx is a serial number, I guess. I just could not run the most simple example of mbed-os-example-blinky. This board defaultly supports Jlink OB so I followen-USTelligent Community 13Fri, 08 Dec 2017 04:53:16 GMThttps://devzone.nordicsemi.com/thread/110441?ContentTypeID=1Fri, 08 Dec 2017 04:53:16 GMT137ad170-7792-4731-bb38-c0d22fbe4515:fd07da39-f34f-49c8-b082-e1318e92a6dfCake Huang<p>Thank you Matt! It works when I drag and drop the blink example into PCA10040 after I restored PCA10040 back to Jlink OB. You are right. PCA10040 originally supports mbed. It does not need to get interface firmware programmed at all....</p> <p>Actually the user guide of PCA10040 and mbed&#39;s link to this board both mention how to swap between Jlink OB and mbed interface..... This made me think I need to update interface firmware. But it is not necessary at all.</p> <p>Hope other guys would not make such silly mistake again.</p> <p>Thank Matt again!</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/110440?ContentTypeID=1Thu, 07 Dec 2017 12:34:58 GMT137ad170-7792-4731-bb38-c0d22fbe4515:b02df143-9fc9-4c0c-ab21-2a20206d23a2Matt<p>Not sure why you need to update the MBED interface firmware at all as the PCA10040 should work as is. Have you tried to use nRFgo studio to load the blinky example into the nRF52?</p><div style="clear:both;"></div>