FRDM-K66F does not enter in bootloader moder after a reset

[nadine]

Hi,

I have received FRDM-K66F boards two days ago. 

I was running the standard demo program "power_mode_switch_frdmk66" to set the board in high speed mode.

Suddenly, the board enter in "bootloader" mode ...

To go back in JLINK mode, I load the "OpenSDA_V2_1;bin file, and the operation probably failed because since this 

time, the board does not seem to be power connected.

When, I connect the board to a PC using the micro-USB cable no LED is illuminated.

Do you thing the board is broken or where the problem could come from ?

Thanks for your support.

Nadine

[nadine]

Hi Kerry,

I have made the test under win7 as suggested in your email with no success. 

It looks like the board is definitively dead, it is not more possible to enter the bootloader mode.

I have another board FRDM-K66F board which is working fine.

I'm a bit disappointed by the lifetime of this fisrt board ... Less than one day.

Thanks for your help.

Best regards

Nadine,

[nadine]

Hi again,

We have made some measurements with a scope.

The J21 connector is not connected to the 5V by the PV5_K66_USB !!!

[kerryzhou]

Hi Nadline Sueur,

   What the PC OS you are using? win7 or others?

   About the J21, in default, there has a sub block short J21.

    If you are not using the win7, please find a win7, try to update the bootloader again.

   About the firmware, please use my attached firmware.

   Any updated information, please let me know!

Have a great day,
Kerry

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