This document describes how to recover a password on a Cisco Catalyst 3900.
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Caution: A download of the main image is forced when you press SysReq for more than five seconds.
Press SysReq on the switch (next to the Reset button).
On the System Request menu, select Clear the System Password.
This clears only the system password. All other configuration parameters are saved in nonvolatile RAM (NVRAM) and are retained.