Hacking Fake signing a Vios to block auto update?

[Risingdawn]

So basically in my thread browsing I've seen mention of a fakesigned vios blocking an auto update but I had a couple of questions.
If you do fakesign a vios but otherwise keep the vios original would this have any negative effects on system functions/stability?
Is it possible to, for example bluedump your vios and keep it %100 clean and non fakesigned to replace at a latter date should you wish/need to update?
What actually happens if your console attempts' to update with a fake vios? Does it simply fail or does it update all but this one vios and then could you update using nus as an example?
Am I just barking up the wrong tree lol?
Cheers guys.

 

[EmceeKerser]

If you dump all your vIOS, ie a NAND dump, and re install them later, its not going to be 100% original because the MD5 Hashes will be different.
Also, if you update with a fakesigned vIOS, and its one that is affected by a wii u update, the update will fail.