Hello,
Unfortunately I dont know this product and dont have experience with it. It seems that it was discontinued shortly after 3Com was acquired by HP. That means I cannot answer your questions.
I am writing here because I saw that there is an HPE firmware download page for this product. You need an HPE passport registration.
https://h10145.www1.hpe.com/downloads/SoftwareReleases.aspx?ProductNumber=JE457A
It provides access to versions 3.6.14 and 3.6.16 which seem to be higher versions than what you found (3.0.1). Unfortunately the links for the release notes are not working. 3.6.14 has short release notes in the zip file but it doesnt contain any information about the feautures you need. Here are the fixes.
4. Issues Resolved in this release since v3.6/14
4.1 URL Filter: “Allow” function did not work
- The unit hangs as soon as a web filter is active
- If the firmware’s file name is “xxx.IMG”, the UI will refuse to upgrade using the file
It also contains a restriction regarding the config migration. It looks configs from version earlier than 3.0 cannot be used and the router has to be set to factory defaults and reconfigured from the scratch after the update.
If you are upgrading from a version earlier than 3.0, you should return the unit to factory defaults. Due to the substantial number of improvements we have made to the product, It is unfortunately not possible to use a saved configuration file to return the upgraded unit back into the same pre-upgrade configuration. We therefore recommend that you make a written note of any settings you have made to your router prior to starting the upgrade process.