cannot program FMU board using SWD , J-Link cannot unlock device.

[manuel_iglesias]

I am workking with FMU board for @HoverGames and while trying to Flash firmware on it using JLink I am getting a protection issue to write. 

Apperantly I was able to Flash a bootloader, one I build myself as shown here

Here is the Flash process

Afterwards any attempt to write to the device is failing and message after connecting shows

Readout protection is set and mass erase is disable. J-Link cannot protect the device.

Any advice how to debug this?

Thanks,

[RaRo]

Hello @manuel_iglesias,

Could you please try the following suggestions?

• Try doing the Programming FMUK66 for first use - NXP HoverGames tutorial again, in case you already did it.
• Please check out the Program software using debugger - NXP HoverGames guide.
• After trying to unlock the board, you could try erasing it with J-Link: Unlocking and Erasing FLASH with Segger J-Link | MCU on Eclipse.
• Also, you could check the following information of SEGGER for troubleshooting the problem: Kinetis Series Devices - SEGGER Wiki, and J-Link cannot connect to the CPU - SEGGER Wiki.

Finally, it might be useful to post the issue at HoverGames Drone Challenge - NXP Community.

Best regards, Raul.