I did that, but when i select download from nus, it starts to init the network. This results in an error, since my wii is not connected to any network/internet, i guess.
Step 2 - Restoring The Bug Into IOS36
a) Load and Homebrew Channel and run DOP-IOS MOD, on the IOS Selection Screen, press down on the d-pad then A on the wiimote. You should now be in the trucha bug restorer portion of DOP-IOS MOD. Load IOS36 and select Downgrade IOS15. Each time it asks, select 'Download From NUS'
Make sure you get no errors.