How to factory reset a Cisco router
Reset button location
Mode button on the front (Cisco AP) or dedicated reset pinhole (Cisco Small Business).
Hold duration
20 seconds
What gets reset
Clears the running config and reboots to the boot-image factory defaults; on switches it reverts VLANs and access lists.
Brand-specific notes
Enterprise IOS devices do NOT have a UI default. You drop to ROMMON / press-and-hold mode to wipe NVRAM. cisco / cisco is for Small Business series only.