Webagent: Setting Passwords And Usernames - HP E3800-24G-PoE+-2SFP+ Access Security Manual

Configuring Username and Password Security
Configuring Local Password Security
If You Cannot Access the Switch Using the Previous Password
If you cannot access the switch after a software version downgrade, clear the
password by using the "Clear" button on the switch to regain access. Then
boot into a software version that supports long passwords, and perform steps
1, 2, or 3 in the preceding section.

WebAgent: Setting Passwords and Usernames

In the WebAgent you can enter passwords and (optional) usernames. See the
WebAgent Online Help for detailed information.
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