mKIT dead

[Maurizio]

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]

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I removed the attachment as a newer version of the file is available from our mKIT product page.