Olympus removed the old firmware from their website. Here are a few I found. Follow the instructions below or watch my video.
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Download Olympus E-500 Firmware Version 1.3 (E0359999.BIN)
MD5 is 84e1460c7b267bea42705ac3a4c74248
SHA256 is e9f5431cb47bf1c73395337256fba6eedf576c03b06c4ef7dea0d387ca7c69ae
Download Olympus E-510 Firmware Version 1.3 (E0419999.BIN)
MD5 is 3c076a419142ee357e2f415c7d8af2de
SHA256 is b9eabb008460163d9ae12556ccba694bbeb4fa070f61cc633b9e750bdbde7a17
Download Olympus E-520 Firmware Version 1.1 (E0599999.BIN)
MD5 is 1b2600cc612dc1dedf4abd82357b700b
SHA256 is 38b94d7df88db8c68a0081c2d28909067107ee02a7a33936f43ce4f1c0bd25f1
Download Olympus E-410 Firmware Version 1.3 (E0489999.BIN)
MD5 is d84b3e2c4915105b82afaef440cae927
SHA256 is 8dc5365b9e2812ec7a32af766a820d29b13bea8134ffa828088a962ed977f3b1
Download Olympus E-300 Firmware Version 1.5 (E0129999.BIN)
MD5 is c91fdbf2c8512c00ee798605c8a66993
SHA256 is 4ec107f7cc9bbeb04cb378e879627eb65efd7aadb3e0bb38d3d564ae6333dde4
Download Olympus E-330 Firmware Version 1.3 (E0369999.BIN)
MD5 is b943d027cda5df70b465d2320c8281bc
SHA256 is 1b717c04095fafc2fb4222e616653c8a8312d5ba17f1baa460aca898358e0d9d
Instructions
Insert your CF into your computer
Create a top-level folder called DCOLYMP
Download the appropriate file and place it in the DCOLYMP folder
Remove the CF Card and place it into your camera (Make sure your Camera is OFF)
Make sure your batteries are fully charged
Whilst holding down the "OK" Button, turn your camera on
The screen will go black and the red back LED light will turn on
DO NOT TURN THE CAMERA OFF WHILE THE LED IS ON.
Wait until it red LED light starts blinking rapidly to indicate the process has completed.
You can now turn off the camera and restart it and the firmware should be upgraded.
You can also delete that DCOLYMP folder that you created as it's no longer needed.
CHECKSUM
To check the file integrety you can cross check the checksum. For windows this is how you do it
Open a CMD prompt window
Change into the directory you downloaded the files
Run the certutil command on the file name and cross check the MD5 or SHA256 with the ones supplied above
Example: certutil -hashfile E0129999.BIN MD5
Example: certutil -hashfile E0129999.BIN SHA256