The newest WiiU system stability firmware update v5.5.1 patched 2 and maybe even more exploits!
MP4 exploit released by Mathew_Wi
It is incredibly bad, and likely won’t run any code for you whatsoever.
since it was patched yesterday, yellows8 has made available his wii u browserhax ! super stable, works on 5.5.0 https://t.co/LAm8qkcDL5
— smea (@smealum) January 12, 2016
Note: Both exploits are labeled to be working for 5.4.0 and 5.5.0 only and will most likely not be of any use anymore! Additionally and in foresight to Hykems still planned-to-be-released IOSU exploit they are no reason to stay on a 5.4.0/5.50 firmware. We however still do NOT recommend updateing at all!
We will keep you posted..