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.