For example i use super smash bros for wii u (PAL version) with update from USA version, does it work?

EDIT: will it brick wii u if i use the wrong region update?

 

why are you still using loadliine??? ....why you are not using brazilian exploit??

 

It's safer than any system update. If you don't install some crap to sysnand then you're alright.

 

just follow the tutorials, e.g. this one: http://gbatemp.net/threads/guide-complete-guide-to-brazilian-exploit-method-on-5-5-1.446415/ ...and yes you can brick but only if you do really stupid things, not if you follow tutorial and read before do