mKIT dead

Question

Hi. 
 My nRF51822-mKIT, when attached to the USB port, don't flashes the green LED nor the drive appear on Windows explorer. 
 It's possible that mbed loader was corrupted?
If so, how do I reset the loader for mBed? 
 Thank

run_ar · Accepted Answer

Hi, 
 Here is a beta version of a file that should fix your problem, an official release will be available next week. 
 This update will work on mkits that are blocked because of the activation of the on-chip memory protection. You can forward this on to the two users who are having issues with their boards. 
 To update the firmware:
	Unplug mkit from the usb.
	Press and hold down the reset button and connect the usb while doing so
	Mkit should now enumerate as an MSD named “BOOTLOADER”
	Copy the binary file attached to the BOOTLOADER drive.
	Wait until the drive dismounts and the mbed LED is flashing continuously
	Unplug the board and plug in again, and the board should enumerate as usual. 
 To erase an NRF chip on a bricked board (this will only work after the attached firmware update is done):
	Connect the mkit via usb and make sure it enumerates as an MBED drive.
	Press and hold down the reset button for ~5s
	The mbed LED will start flashing while the reset button is pressed, and after 5 seconds the LED will flash at a faster rate to indicate the NRF chip erase.
	Once the above step is complete the nrf chip should be fully erased and the board unblocked. 
 I removed the attachment as a newer version of the file is available from our mKIT product page .

mKIT dead

Top Replies