1. Ensure you have JAVA on your computer (Windows/Linux/Mac)
2. Download and execute i897-Speedmod-K13E-GBbootloaders-One-Click.jar from this location: http://teamkomin.com/index.php?dir=Captivate%2F
3. Follow any directions given and when your device is "Connected" click flash
--Optional--4. If you have problems, put your device back into Download mode, check the "Flash Bootloaders" checkbox and click flash again to reflash bootloaders and repartition.
Download Speedmod Kernel Heimdall One-Click