You can refer the user guide
http://support.3com.com/infodeli/tools/switches/baseline/3Com_Baseline-Switch-2916-2924_User-Guide.pdf
Unfortunately, there is no way to recover a lost or forgotten password from a router or access point; you will need to reset the device to factory defaults. However, once the device is reset to factory defaults, you can use the default username ("admin") and password (either "password" or "1234" depending on your router) to reconfigure your router settings.
or
if there is a small hole in the front or back of the router push a hair pin in to reset to factory settings
hope this helps
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