If you have decided to bring your Synology Nas back to its virgin status, a.k.a. “Manufacturer Settings”, there are two methods for doing it: a “mechanical” one and a “software” one. Every Synology NAS server comes with a RESET button located behind the device, near the fan.
This method is very simple. All you have to do is go to the Control Panel under Update & Restore. Control Panel/Update & Restore/ Reset/ Erase All Data. Follow the instructions in the image below and you will bring your Synology NAS back to its manufacturer settings in a few minutes. Warning: this operation deletes all data on your disks and all your saved settings.
Note: If you do decide to bring your Synology NAS back to its factory settings, it must mean you have a really good reason for it. Because, by doing so, all your data, your settings will be deleted and there is no possibility of recovery. This is an action from which you cannot go back. It’s irreversible.