Okay, I was finally able to get it working with the 1.1 FreeDos from Christian T.a.u.b.e (the large version), and selected "fdos" and "4" (no drivers)   It worked the first time. [URL]#Pre-built_images
I have an old Optiplex 380  I have been using as a media center.   It is currently running Linux Mint.   It shipped with only a single 2GB RAM module, so I wanted to upgrade the RAM.  From a few posts here, I found that you need to update the BIOS to enable the use of additional RAM up to 8GB.  My current version is the factory stock A00. Dell lists the following two BIOS versions: A04 - Critical Update    &   A07 - Recommended I created a FreeDOS 1.3 bootable USB stick with Etcher, then copied over the two BIOS updates.   I was able to boot into DOS, and I tried both updates.  Both "failed an integrity check" during the install process. I tried a new, unused USB drive, running Etcher on a different machine.  I re-downloaded the files and verified their hashes after download and after copying to the USB stick.  I get the same error. What should I try next?
BIOS Update Optiplex 380 Failed (Failed Integrity Check)