This is a patch for Ocarina of Time 3D. It works with the European version of the game.
The patch has two major additions.
Software
Increase the render and presentation resolution.
On the Old 2DS, rendering is performed at 800x480 and...
Removing "Please connect a nunchuk" screens
For fixing Nunchuk errors, usually I will load the game up in Dolphin and let it run until it reaches some kind of Nunchuk error screen. Then in the Memory tab I will switch the search type to ASCII...
They are compatible. With only one side of the Wii U gamepad, which iirc the right one. The other one has reversed power polarity. Hense why it is just easier to use Xbox or PS4 ones and swap the modules, since they come with both polarities.