Why are some of TinyUmbrella's options disabled?

[alec6542]

I am trying to save my SHSH blobs for the first time, and every tutorial/instructions that I've come upon say that in TinyUmbrella, the option "Set Host to Cydia on Exit" under Advanced MUST be checked. When I went to do this, I noticed that this option is disabled. I searched and cannot find anyone else with this problem. Any ideas? Here is a screenshot:



Should I still go ahead and save the blobs anyway without the option selected, or is there something seriously wrong?

Thanks for any help!

 

[The New iPad]

It doesn't need to be checked. Source: been saving and restoring with SHSH blobs for years

 

[Rajani Isa]

The set host to cydia is mostly for installing firmware Apple is no longer signing.

 

[TriJetHero]

With 5.0 Apple changed the way it checks for a valid signature.
Your host file needs to point to Apple not Cydia.

Actually the set host to cydia is ONLY used for older firmwares. From 5+ onward the set host to cydia needs to be UNchecked.