You are guilty of the same oversight as me…
http://forum.snapmaker.com/t/downloads-and-updates-for-firmware/1467/11
You use the snapmaker.js software. You connect a USB cable from your computer to your snapmaker, and start up snapmaker.js. Press the “open” button (I think its called open), which connects you directly to the snapmaker.
You will see a black window on the upper left that looks like a dos box. Type in the M1025 M1 command, and it should be done. While you are at it, you should probably do a M1005 – this will allow you to confirm what firmware revision you are on.