1. Switch off the device
2. Press button INIT or FRES (depending on the herdware version) and keep it pressed. Button is in the hole of the case, so you'll need approprate long and thin "tool" e.g. pen.
3. Switch on the device
4. After 30secs leave the button ( depress it )
5. Wait for VBE/OFR to boot.
When you finish it you'll have the default IP address. It has been 10.0.0.1 till version 2.3.1. Since 2.3.1 default IP address is 192.168.1.1.