What games you try except a VC titles?
I test some games and it's works great. Only new games get a BSOD 160-2203 error (Mario Maker, Just Dance 2016 and Yoshi Wooly World)
Tested worked games by me
Call Of Duty Ghosts
Mario 3D World
Sonic Lost World
Mario Kart 8
Kernel exploit is unstable, so you need many times before it's started.
But there is little tip: Reboot your WiiU after RaceAttack and try again (it's real can help).
Loadiine (v4) for 5.0.0\5.1.0 WiiU
Backup loader now ported for old 5.0.0 and 5.1.0 fimwares. Works great, only Kexploit is unstable.
Compatibility list same as for 5.3.2 version:
http://wiki.gbatemp.net/wiki/Loadiine_compatibility_list
Update. I see few games not work, like Super Mario Maker...
sorry, beein trying to find this file that's been right in front of me for a month now, only to find broken links, and google to prove that it's completely worthless.