Hacking wii 4.2U hacking

[crimsonsoulz]

i recently got my wii repaired, it now on firmware 4.2U all my homebrew is still intact including the homebrew channel. However most applications do no work anymore, i just get a black screen. also when i try running wad installer 1.5 my wiimotes desync. So i tried following this guide -snipped- (old warez site version of the Simplistic Mod) (new 4.2U guide) but when i try downgrading my IOS15 i get the following error message. error: ES_addTitleStart returned -1035, maybe you need an updated downgrader
error: Could not set the revision to 0
downgrade failed.
press anykey to restart.

i also tried using pimp my wii and got a similar error message.

help would be appreciated