Help !!! ROM LOADING FAILED

When I try to play game after download I get error message below .ROM LOADING FAILED
LOAD ROM ERRCODE=-7
PLEASE RESET SYSTEMthanks,

Update your firmware at http://www.linfoxdomain.com/ds/.

This is my first time using this dstt how do I update firmeware and where do I insert?

Download the latest DSTT firmware from link above. Extract, get all the files, and put them straight onto your MicroSD. Then it will ask you to overwrite, choose Yes to All. Done.