Let me register here what I passed yesterday night. May be a little long, but...
After reading a lot, I decided to update to SM 4.0.
My Wii was 3.3U with no modchip and had only the HBC and Backup Loader Channel 0.3 gamma.
I decided to follow a mix of 2 tutorial. One I got from blackcats and this, from this topic. My decision is that because I wanted preloader intalled and the BC teaches how to install startpatch, but it has all wads inclusive from cIOSCORP.
Well... so I begum reinstalling IOS16, as it asked to, but I didn't need, since I had it installed already.
After that, I started the update from Wii System Update. Everything was going fine, but..... after 10 minutes of downloading the update, I got a 32007 error.
OK, I thought, I just have to start it again... BUT.... when it returned to SM, I saw the SD Card icon !!! "What the hell is that ??" I thought... "The upgrade was successfull or not ??"
I went to Preferences and there was the 4.0U number. Then I was afraid to restart my wii and if some IOS was not updates I was screwed.... so I went to System Update and started it again....
After some minutes, I got the same error. Then I decided to start Waninkoko's FW Update. It started downloading IOS37, but after some contents it returned an error... "And now...What do I do ? " I thought.
I started Wanin Update about 10 times, and always got the error (it could have some cache for downloaded contents !), some sooner and others farther....
I checked my internet and it was OK. Google for the error and got a message from nintendo saying to check the wireless and to set the channel to 1 or 11 (mine was set to 6, since was the less crowded when I searched once a time ago).
After that I started System Update again, and it was flushing very very good... BUT... at 50% I got again the 32007 error !
I was starting to get angry. Got out of Preferences and went do System Menu.
Then, I don't know what gave to me, but I clicked on Shop Channel, I think just to see if everything was rigt (but it wasn't, of course !). So, got a blank screen and the wiimotes stoped working... that time I think I was really, really screwed....
Rebooted wii and it was NOT dead (or bricked). A little bit relaxed, I opened Wanin's Update again, and started... got a surprise here, it started downloadind ShopChannel !!!! Wow, so the Wii's update really updated something useful !!!!
After some more tries, Wainin's Updated sucessfully downloaded ShopChannel, Mii and Photo Channel Updates... installed and reboot my wii.....
"Oh my God" ! Great !!!!
The next thing I installed was preloader ! hehe...
then all worked like a charm... installed preloader, cIOSCORP WADs, IOS Downgrader, preloader (again)...
Now I have my wii fully working on 4.0 and Start backups from Disc channel...
If somebody reads here, I'd like to ask ond thing:
Does Dual Layer DVDs works with these hacks ? I have smash bros on DVD9, but it does not even recognize the DVD....
Thanks a lot for everbody that made it possible !!!