Member Avatar for fooboo83

I just purchased a 3.06Mhz processor for my Dell Dimension 4550. After doing some research, I learned that a bios upgrade would be required. I followed the download instructions and the .exe is right where it shoud be. When I try to run the extractor, I get the usual security warning, I click run and the dos prompt pops up and then disapears just as fast. According to the directions from Dell, I have enter the dos prompt. The only thing I can think of is that I had a problem a while back and wiped the hard drive and I didn't use the Dell reinstall disks. I instead did a fresh XP Pro install. I've heard rumors that Dell somehow ties their version of Windows that comes loaded, with the bios. Any ideas?

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: a clean XP install will not prevent a BIOS flash. Dell BIOS updaters are usually self‑extracting packages that either launch a Windows flasher or prepare a DOS boot disk. When the little DOS window appears and disappears it often means the package tried to create boot media or ran and failed silently (no floppy, no write permission, or an extraction error). and are on the right track pointing to the bootable media approach and running from DOS.

Practical, low-risk steps to try:

  • Confirm the correct BIOS file for the exact Dimension 4550 model and note the current BIOS revision in setup or System Information.
  • Use an archiver like 7‑Zip (https://www.7-zip.org/) to extract the .exe into a folder so you can inspect the files. If you find a ROM and a DOS flasher or batch file, copy those to FAT media.
  • Create a FreeDOS bootable USB or floppy (Rufus makes USB FreeDOS easily: https://rufus.ie/; FreeDOS info: https://www.freedos.org/). Boot the machine from that media and run the flasher from DOS.
  • If the EXE closes too quickly, run it from a Windows command prompt so any error text stays visible, and check the Temp folder for extracted files.

Cautions: double‑check model/BIOS match, use AC power (or UPS), and do not interrupt the flash. If you cannot get a DOS boot option (older BIOS may not USB‑boot), use a floppy or burn a FreeDOS CD, or contact Dell for recovery options.

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Member Avatar for jbennet

run it from a DOS floppy, not from XP.

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