Copy this into the cmdline.txt at /mnt/mmcblk0p1:
wc_otg.lpm_enable=0 console=ttyAMA0,115200 console=tty1 root=/dev/ram0 elevator=deadline rootwait quiet nortc loglevel=3 noembed nodhcp tz=CET-1CEST,M3.5.0,M10.5.0/3
Be sure that it is in ONE long uninterrupted line !!!