Accidentally I've wrecked my FRDM-K64F totally during playing with J-Link Lite CortexM JTAG probe. The situation is so bad that connecting the USB to the OpenSDA interface neither any LED lights up, nor appears the device as MSD (even if I keep the reset button pressed during power on).
I haven't found any usable information on recovering the K20 from scratch (every article is only about changing the application in K20, so that it's possible to switch between OpenSDA1/2 etc.). It appears the bootloader itself is broken. Can I somehow fix it by using J-Link Lite? I'm using linux and the command line tool JLinkExe.