My chip set is IMX6UL.
I have one closed-configuration device which been tampered.
Then I used mfgtool to re-download images to flash.
However, these images are illegal.. because I used the wrong keys to sign images..
The target cannot be booted up so far, it will enter into serial down mode.
However, I cannot use mfgtool to upgrade images at this time.
Could you tell me how to recover this target?
Or the target becomes brick permanently?