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.
Not all USB disks or sticks are compatible for this procedure to be successful. At end of the procedure, if the plug's IP address scheme is not reset to DHCP, please repeat the procedure with a different USB stick.