I need to delete a flash file(upgrading IOS on Cisco 3750) but there isn't enough space for the new IOS. I tried del /force /recursive flash1:filename, but didn't work. It doesn't give an error, but the file is still in the folder. I can still see it, and the space isn't released. If I remove the options(force /recursive), then it tells me that the file doesn't exist. However, I can still see it, and the space isn't released(%Error deleting flash1:c3750-ipbase-mz.122-35.SE5.bin (No such file or directory). I really need to upgrade the IOS from the base IOS. Can you get me through this?