LenovoEMC px4-300d NAS and password

Hello,

According to the manual:
https://download.lenovo.com/nasupdate/manuals/px4-300d/px4-300d-4.0-fr.pdf#page=169

You just need to hold down the reset button to restore the network and security settings. It seems that this does not erase the data, but make a copy elsewhere just in case.

Thank you for your quick response. I didn't dare to do that for fear of losing the data, but I believe I have no choice.