How to unlock bricked MCU with J-Link?

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How to unlock bricked MCU with J-Link?

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rémiraynaud
Contributor III

Hello,

I'm with a MK22F512xxx12 connected by SWD with a FRDM-K22F. The Mcu is blocked, I cannot debug or erase.

Nouveau Image bitmap.bmp

Do you know how to unlock the Mcu?

Thank's, Best Regards

Rémi

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4 Replies

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jscott
Contributor II

As I recall, this can be accomplished by typing "unlock kinetis" in the J-link command line.

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rémiraynaud
Contributor III

I've tried to "unlock kinetis" (look at the command line in the screenshot, attached to the post) in the J-link command line but it doesn't change...

Thank's for yours answers

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jscott
Contributor II

Ok, sorry I missed that.

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ivadorazinova
NXP Employee
NXP Employee

Hello rémi raynaud​,

I can recommend you follow these steps, described here Unsecuring the KL25Z Freedom Board | MCU on Eclipse

also it is discussed at Freedom board - "Device is secure. Erase to unsecure?"

If your problem does not appear, please, let me know.

Best Regards,

Iva

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