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Communication error while accessing MDM-AP.

Question asked by ditto xia on Dec 5, 2016
Latest reply on Dec 12, 2016 by Hui_Ma
Dear :
    We are using MKE15Z256VLL7 microcontroller,But encounter problems.
MCU suddenly can not download the program.list is the JLink.exe`s log:
Connecting ...
 - Connecting via USB to J-Link device 0  - Target interface speed: 4000 kHz (Fixed)  - VTarget = 4.962V  - ERROR: Kinetis (connect): Communication error while accessing MDM-AP.  - ERROR: Failed to connect. Could not establish a connection to target.
We suspect that MCU is locked up,So we're trying to unlock it,Here is our way to unlock and screenshots.
JLink.exe erase_all_pin.jlk
Jlink_commander unlock kinetis flash
JLink.exe erase_all_pin.jlk
Eager for your help, thank you!