Right now I have a microcontroller KL27 has BOOT ROM. The first time I connected to the USB port, the computer recognized it well..
From KinetisUpdater.exe I could program a small project to light a led. It worked well.
The problem is that now is not detected by the computer to continue with the tests.
- That recommendation can give me for the microcontroller can enter Bootloader mode once again.
- As I can set "bootloader configuration area" from processor expert and as I do when no use processor expert.
In the circuit, I have a button on the PTA4/NMI_b pin.