Reset to default settings

[intern]

Hello!
I cannot to get access to my Guruplug Server Plus by network - I see only AP. I don't see it in LAN.
How can I reset settings to default?
I tried to reconfigure it before: change eth0 from DHCP to static address, eth1 was configured for DHCP.

Thanks.

[intern]

I can to connect to device rebooting it with net cables in slots. My settings works!