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. 

manuel_iglesias_0-1673771953811.png

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

manuel_iglesias_1-1673772107136.png

Here is the Flash process

manuel_iglesias_2-1673772151622.png

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.