Insert the USB memory stick with the .str file into one of the USB ports on the back of the DVR+(CM-7500) When the DVR+(CM-7500) recognizes the software file, you will see a popup on your TV screen notifying you that you are about to update your software. Transfer the .str file to an empty USB memory stick IMPORTANT: Make sure there are no other files on the USB memory stick, and do not rename the .str file or place it in a folder. For instructions on how to update software, Click Here. Select CONFIRM. Although not required, we suggest a factory reset after updating software.