1. Download the SOA004XDBU.EXE file to a temporary or download directory (please note this directory for reference).
2. Go to the directory where the file was downloaded and double-click the SOA004XDBU.EXE file to begin the installation.
3. At the "BIOS 1004 update utility For Windows XP- InstallShield Wizard" box, click Next. Several setup boxes will briefly appear as the files are extracted and the notebook model is identified. As these processes complete, the boxes will close automatically.
4. At the "Information" box, insert your prepared 3½ bootable floppy disk into the drive.
5. Click OK to begin copying the BIOS files onto the bootable floppy disk.
6. At the "InstallShield Wizard Complete" screen, make sure "Yes, I want to restart my computer now." is checked and click Finish. Leave the bootable floppy disk in the drive. As the computer restarts, it will boot from the floppy disk instead of the hard drive.
7. After the BIOS files are copied to the floppy disk, verify that "Yes, I want to restart my computer now" is selected and click Finish. As the computer restarts, it will boot from the floppy drive. The BIOS update utility will launch.
8. At the "Do you want to update BIOS(1004) for PCV-RX360" prompt, press the Y key. The Sony BIOS Flash Program will launch and start the BIOS installation. Please wait as the installation of the BIOS will take one to two minutes to complete. Once the installation is complete, the computer will automatically restart.
9. At the black VAIO screen, eject the bootable BIOS installation disk from the drive.
10. At the "CMOS Checksum Error - Defaults loaded. Press F1 to continue, F2 to enter SETUP" prompt, press the F1 key. This message is normal and will only appear after the computer restarts for the first time.

After the computer restarts, the installation of the BIOS is complete.

• Before installing this BIOS revision, you will need to prepare a 3½ formatted bootable floppy disk. For additional assistance, please see Creating a Bootable Floppy Disk for Windows XP BIOS Updates
• During the installation of this update, be sure that you are logged in as the Administrator or as a user with Administrative rights.
• To ensure that no other program interferes with the installation, save all work and close all other programs. The Taskbar should be clear of applications before proceeding.
• It is highly recommended to print out these instructions as a reference during the installation process.