The 3com website is remarkably shoddy on this issue, and doesn't have the newest required updates. Even the KB on their site is thin on solutions.
You really need firmware 3.6.4, yet 3.0.1 is the latest on the official website. Try this page:
http://3crwdr.googlepages.com/
for the very latest firmwares, and note that it's best to clear out the router memory completely before adding the new firmware to it. This is because it sometimes doesn't like the new image files otherwise. The way I suggest:
1. Note all of your settings manually (don't save a config file, it may not read back in).
2. Hard reset and clear the memory, by holding down the reset button and powering on.
3. Connect to 192.168.1.1 with your browser - you may need to mess with the network settings on your PC to get it to connect. You will see a very bland screen, asking you for a firmware file, rather than the traditional login screen.
4. Upload the latest firmware, downloaded from the site above.
5. Allow the router to do it's business and restart.
6. Connect back to 192.168.1.1, and you will once again see the correct router software, with a new install wizard.
7. Re-enter all your settings, as noted above.
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