mine came to life after i updated aroma and my plugins, give that a shot if you haven't already.

Its easy. First you need to go to the Pretendo Website. Then up you see Docs click, then Pretendo install then again. Now click on Wii U. Scroll down until you see Nimble click on the latest release. It will bring you in github and download 30_nimble.rpx. (Wait for Part 2 Comment

(Here is Part 2) Ok go to wiiu folder, then enviroments, then aroma, then modules, setup, and here grab the 30_nimble.rpx and put it here. Now put your SD Card to the Wii U and then there you have it. :D

just recopied all the files in my sd still not working