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Copy the Update to a USB Flash Drive
If you don't have an Xbox LIVE account or have a slow Internet connection, using a USB flash drive is a good option.
Note
The USB flash drive must use the FAT32 file system.
Update using a USB flash drive:
Connect your USB flash drive to a USB port on your computer.
Go to the Xbox download page to download the update folder.
Save $SystemUpdate_NXE.zip to your desktop.
Unzip the file.
Copy the contents from the unzipped folder onto the root of your flash drive.
Safely remove the flash drive from your computer and plug it into a USB port on your Xbox 360 console.
If your console is on, turn it off, then back on.
The update program will start automatically. Select Yes, update now.
When you see the new dashboard, you're done.