Dell Inspiron 15z (1570, Mid 2009) - Manual (Page 6)

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Flashing the BIOS
Dell™ Inspiron™ 1470/1570 Service Manual
To flash the BIOS, locate the latest BIOS update file for your computer at support.dell.com.
1. Ensure that the AC adapter is plugged in, the main battery is properly installed, and a network cable is attached.
2. Turn on the computer.
3. Go to support.dell.com.
4. Click Drivers & Downloads® Select Model.
5. Select the type of product in the Select Your Product Family list.
6. Select the product brand in the Select Your Product Line list.
7. Select the product model number in the Select Your Product Model list.
8. Click Confirm.
9. A list of results appear on the screen. Click BIOS.
10. Click Download Now to download the latest BIOS file.
The File Download window appears.
11. Click Save to save the file on your desktop. The file downloads to your desktop.
12. Click Close if the Download Complete window appears.
The file icon appears on your desktop and is titled the same as the downloaded BIOS update file.
13. Double-click the file icon on the desktop and follow the procedures on the screen.
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NOTE: If you have selected a different model and want to start over again, click Start Over on the top right of the menu.