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KL25Z not recognized

Question asked by Rebecca chang on Aug 23, 2016
Latest reply on Aug 24, 2016 by Styger

I have a KL25Z board not recognized by the Windows 7 64-bit PC.  I can get into the bootloader mode to update FW, but after power cycle the board was not detectable by the PC (no mbed drive mounted).

 

I had the board for a while and it was functioning fine until today.  It started out that the board was recognizable and I can see the mbed drive.  However my program (.bin) was not executing correctly.  So I reloaded FW(20140530_k20dx128_kl25z_if_opensda.s19) via the BOOTLOADER mode.  After the FW update, the board became undetectable by the PC.  I can still get into the bootloader mode, the on board LED will flash fast 7-8 times then pause for 1 sec. I tried the same process (FW reload) using another KL25Z (again one that used to function well) and getting the same result (board nolonger recognizable).  I tried another Windows 7 machine with no luck.  

 

Any one had similar experience?  Please help!  Thanks in advance.  

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