Nothing but installing and configuring minidlna and ShadowsocksR. And of course configuring the WiFi access (WPA2 passwords etc.).

The 5G WiFi works for a while, but then it shuts itself off (in the GUI the switch is still on).

I need to switch it off and on in the GUI or restart the router to have it activated for the next couple of minutes before it dies again.

2.4G WiFi is fortunately not suffering this issue.