Here are some detailed instructions for installing the update that I found helpful on the Hardforum site: (to be done on a Windows PC)
I suggest creating a USB flash drive boot "disk". Assuming you already downloaded the patch, download
HP USB Disk Storage Format Tool and
Windows 98 System Files. You can substitute FreeDos for the Win 98 files if you want as others have suggested using that.
1) Install and run the HP USB tool to create a "bootable USB" by selecting that option and target the Win 98 files (or FreeDos). Check the quick format option as well. NOTE: - you will lose any files already existing on the USB drive so back up your data before doing this! Optional - back up the data on your F4. I've patched several times and so far it has not affected the data on the hard drive, but you never know.
2) Unzip the patch and copy it to the USB drive (don't put it in a folder - just copy it to the drive).
3) Turn off the PC.
4) Make sure that the F4 is conected to the motherboard directly via a SATA cable (using a front bay hotswap rack is fine as long as it also connects directly to the motherboard via a SATA cable). I recommend disconnecting all your other hard disks from the motherboard just to be safe as well as patching one F4 at a time.
5) Power on your PC and enter the bios: (A) Set the bios to "IDE" or "SATA" if you have ACHI enabled or RAID, and (B) change the boot priority so that it boots from the USB drive (FYI, on my Asus board the USB flash drive shows as hard drive on the boot priority section, not a "removable device").
6) Save/Exit the bios & restart. You should now boot into DOS.
7) At the ">C:\" prompt type "F4EG". The patch should now run. After a minute or two you should get a message "download successfuly completed" followed by a serial number and then back to the C prompt. Alternatively, according to Samsung though I haven't seen it, you could get something like "poweroff system after patch sucessful..." instead.
8) Power off PC via the power button - do NOT restart!
**If you have more than one F4 and are patching one at a time, replace the patched F4 with the next one to patch, turn on the PC, and repeat steps 7 & 8. Repeat until all drives are patched.
9) Reconnect any previously disconnected hard drives and remove the USB flash drive.
10) Power on PC, change bios settings back to where they were, save, exit, and boot up as normal.
If you can't get it to boot into DOS (a) substitute FreeDos files for the Win 98 files (or vice versa), and/or (b) try another USB flash drive - especially if the one you used was older. That happened to me even though when I bought the drive it specifically stated it was "bootable."