I'm not sure I understand what you're trying to do, so I'm not sure you're going to get answers that help.
The end of your note asks for help deleting stuff of the SD card, but it's unclear why. An 8GB card is big enough to hold everything, so there's no need to go delete anythinhg.
Your first sentence says, "My update screens are crowded with things I don't use." So...is your real goal to scale down what's presented to you during the update process to make that simpler? Deleting files off the SD card isn't going to help with that.
Could you clarify what you're trying to do?