I would like to know this also please

 

If you're that worried, make a nand backup (https://gbatemp.net/threads/nand-dumper-create-full-dumps-of-the-nand.465680/), backup all of those files to a computer/cloud/whatever, and then update. You can always revert back. Your Haxchi isn't going to disappear.

 

Easy.
If anything ever goes wrong with your Haxchi install, for example if an update goes wrong or you reinstall it to change the config and you mess up the config, then you'll have no way to reinstall it. No way to get back into homebrew. You'll be screwed.
Not having any primary entrypoint and relying completely on a secondary entrypoint that might stop working at some point is worrying to me.

 

You gain nothing by updating and loose the only primary exploit you have as @The Real Jdbye mentioned, so why would you knowingly update?

 

well, the app is still there, so you can just launch it and launch CBHC installer

 

In theory if you are on 5.5.1 than your FW is still exploitable still if they find another hole in the browser?

 

If it ain't broken definitely wait, see if any new entry points arises. People shouldn't hurry so much updating their modded console.. You need to be sensible with your actions once you installed any Homebrew, many people are way to unhesitant in doing stuff that can brick with no knowledge to updating when not needed at all.

I feel sad for those whom got their console autoupdated, but they should've blocked DNS in the first place.

Personally mine wasn't even plugged in when the update dropped and I will stay on 5.5.1 atleast for now, I will see and let the time pass. If new entry point is found I might update, if not I'll stay on my current firmware.

You never know if you need to format your Wii for some reason and boom no entry point. I know it can be restored with nand backups. But many don't even have that nor know how to use it.. Hence I'm staying on 5.5.1, it's just easier and safer for the avarage user to NOT UPDATE at the moment if you don't have any problem now, since the update juśt blocks browserhax and adds no functional to the console.

 

You can launch mocha from cbhc menu and then go to settings to see the real sys ver

 

There's no compelling reason to go to 5.5.2, no functionality is added, nothing is fixed or improved, why would anyone want to update to an exploit-breaking firmware?

 

Using just DNS will not block everything.

You need to go into your router settings and if possible block these addresses.

*.cdn.shop.wii.com
*.cdn.wup.shop.nintendo.net
*.deploy.akamaitechnologies.com
*.deploy.static.akamaitechnologies.com
*.wup.shop.nintendo.net
184.50.229.137
184.50.229.158
96.17.161.145

23.65.181.75
http://nus.cdn.shop.wii.com/ccs/download/
c.shop.nintendowifi.net
cbvc.cdn.nintendo.net
cbvc.nintendo.net
nus.c.shop.nintendowifi.net
nus.cdn.c.shop.nintendowifi.net
nus.cdn.shop.wii.com
nus.cdn.wup.shop.nintendo.net
nus.wup.shop.nintendo.net

The reason DNS will not block everything is those IP addresses (the just numbers octets) do not require any DNS for connectivity. DNS is short for Domain Name Server, it basically translates www.yourname.com into 255.255.255.255 (an invalid IP there, well it's valid but not used...) if you have 123.123.123.123 you don't need to go through DNS at all.

I hope this clears up some confusion about how Wii-U's can update in spite of having some weird DNS settings.

list shamelessly copied from https://wiiuhax.com/tutorial-how-to-block-wii-u-firmware-updates/