How does the hardware reset button work?

Answer:

Reset the Password Using the Switch’s Reset Button

Press and hold the Reset button for about 15 seconds
After about 15 seconds, the device automatically reboots and restores the password to its factory-default value.
Only the password is affected; all other settings—such as IP address, VLANs, and firmware—remain unchanged.

Note: Some models may not support this feature. Always refer to the product manual for your specific device.