WII SAVE GAME MANAGER FOR DATA.BINS CODE
The zestig source code can be downloaded from here.
WII SAVE GAME MANAGER FOR DATA.BINS UPDATE
If your Dolphin version does not have this option, update to a newer build.
Select Options (gears icon) on the far right. Use a GameCube Controller or the Power and Reset buttons to navigate through the BootMii menus, as detailed here.