One might go to a computer technician as him/her to update the bios. Or one could do it at home. If upgrading at home, the needed software can be downloaded from Dell's official website.
You do not, the version above A05 is written by Dell, not Phoenix. Once installed, the Dell version rewrites the BIOS with a different format and from that point on you are stuck with Dell's version of the BIOS. Unless you buy another motherboard with an older version of the Phoenix BIOS, you have to live with what you have. Unless you can remove the BIOS Chip, you currently have and solder an old Phoenix BIOS chip in its place.
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The Dell Dimension 3000 made its debut in 2004.
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A Dell Dimension 2400 can be downloaded right from the Dell website directly. There is a site called Tom's Hardware that a Dell Dimension 2400 driver can be downloaded. A website called Solvusoft has a website that a Dell Dimension 2400 driver can be downloaded.
One might purchase a Dell Dimension 4500 from the Cputopia website. The website offers a variety of Dell made products, including the Dell Dimension 4500.
Dell Dimension 'specs' cannot be bought. Specs or specifications are simply the dimensions, memory and operating system of a computer. Dell Dimension computers can be bought directly from the Dell site.
The Dell Dimension 4550 first appeared to public in early 2003.
You may purchase Dell Dimension memory upgrades by going to Sears. You may chose the type of update that best suits your needs and place your order directly for faster service. For a 1 GB upgrade, it will cost under twenty dollars.
The Dell Dimension 4550 did not come with any version of Linux.
The Dell Dimension was a computer manufactured by Dell. The Dimension C521 was replaced by the Dell Inspiron in 2007. One can purchase a restored C521 on eBay or Amazon. There are many listed at reasonable prices on both sites.