Zyxel_David  Zyxel Employee

@ramon Hi, Please have a look here: How to Upgrade from an older Firmware Version?

Hello and Welcome to our Community! You cannot directly upgrade from 4.15 to 4.70. In this case, you can read our knowledgebase article here. The older Firmware downloads are to be found here. I hope that this helps.

Hi, We currently do not have a native 2FA with the Google Authenticator App in the on-premise mode (non Nebula). We are still working on an implementation. It is, however, already available in Nebula. In this Article: 2FA Overview Article, You can find all the currently implemented 2FA Methods.