I'm running into a strange situation. Suddenly, I lost FRDM-K64F Open-SDA connection. I followed several posts in this Community, but nothing works. The only thing I didn't try yet was reprogramming K20 with the Open-SDA .srec file, because I don't have a Universal Programmer like U-Multilink or a Segger J-Link.
I don't know what to do anymore.