The new update is trinity_gm_can_gas-1r07a_update.crom
and be sure to also update to the latest DSDownloader version 2.2.2.2....
You can use up to a 2GB sd card...
make sure the trinity is off before inserting an sd card...
you can use the sd card for saving data logs to it, save custom tune files to it, save your custom gauge dashboards to it, get the copies of your original backup and last tune written tune files to it, etc etc...

