Homebrew Updating Bootmii?

[OmerMe]

I have Bootmii installed, I have no idea what version, I installed it because a guide about updating to 3.4 or 4.0 I can't remember said so.
I don't like it, feels like I'm killing the Wii. >< But I'll keep it since I know it can help if I ever brick my Wii (I'm kinda sure I won't, I'm the only one using the Wii and I don't do things that could kill it.)
Anyway, I remembered I have it installed, so I tried using it (Powering the Wii on while pressing select), and I saw there was an "Update" option, so I pressed it.
And now all I see it "downloading changelog..." for quite some time. And my Wi-fi is working.
Can I just turn the Wii off at this point and update using a wad or something?

Also, I'd like to update my Shop Channel, but I don't want to install things that mess with the NAND.. seems like trouble to me.
Is there a way to install a IOS or cIOS or something tot update the channel? I'm on 4.1E.

Thanks.

 

[tj_cool]

Wait, is this about bootmii or preloader?
If you have to hold reset, it's preloader (bootmii is the thing that starts automatically)

Anyway, I think it should be safe to turn it of as long as it's only downloading

For the newest shop channel, run WiiSCU

 

[OmerMe]

Huh.. I guess preloader then..? xD
I got passed that screen, and it said: "Press A to update or B to cancel" so I pressed A, and it told me I can't update because I use IOS60 or something, so I didn't update.

Doesn't WiiSCU do stuff with the NAND that can mess up my Wii or something?