Synology Reset to factory settings
Reset
Press rest "button" for 4 seconds (3 beeps) -> Admin password reset.
Unhold and repress for 4 more second (3 beep) -> Overwrite operating system.
Download Synology assistant
With Synology assistant, you can find and reinstall operating systems.
References
Daniel Simao (talk) 00:50, 11 August 2018 (EDT)