SOURCE: we have a 3CR858-91 3com router and nobody knows
I have same problem. So the solutions is (in my particular case), when you done everything as it written in the reseting instruction. You face blinking LAN/WAN ports and no any activity with Alert LED. After 30 second or even 1 min (i don't relly know do you need to wait or not), i disconnected LAN/WAN ports and connected it again without repowering. Then Alert LED starts to blink slowly every 2 second. After re-applying power it was reseted.
SOURCE: Reset a switch
Please login in Switch usign Default ip
then in last menu they give one option reset switch as factory default setting please click on this.
SOURCE: Hoe do you reset a 3Com Superstack3 3870 to
Username: recover
Password: recover
*** Password Recovery Mode ***
The administrative password will be cleared if a hard reset operation is
carried out on the device within 30 seconds.
If a hard reset operation is not carried out during this period, the device
will return to the CLI login prompt.
SOURCE: 3com AP 7250 - how do i reset it to factory defaults if i don't have the admin password ?
It will have a reset button on it, hold it down for ten seconds and it should reset the router to factory.
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