I think the error “-sh: echo: write error: Device or resource busy” is because the GPIO is already been exported. To avoid getting that error you can unexport them with the optional steps in Sergey’s blog or you can ignore the 3 first steps (since they are done) and continue with the rest. I hope that works for you.
Thanks. That did work, but it didn't seem to help the issue.
Could it be because the Galileo isn't really using 5V to communicate? Has anyone else ever had a similar problem?