1. Download the password recovery zip from the following link. http://www.tonidoplug.com/packages/dhcpnet.zip
2. Unzip the contents of the zip file onto an USB stick (FAT32 formatted stick preferably). Ensure that the USB drive has the following structure. <USB_Stick>\tonido\autoexe\dhcpnet.sh
3. Now plug the USB stick into TonidoPlug and wait for a minute.
4. Now TonidoPlug should be configured for DHCP.