It has been released for month now, not only for 3.x but for all firmwares. This coldboot exploit is called Fusée Gelée. E.g SX OS by Team Xecuter uses this exploit. No modding of the hardware is needed. All can be done just with the dongle and jig. If you want, you can do a hardmod instead by e.g. placing a Trinket M0 inside of the switch.however one of them has not been released yet
Last edited by c80,