very good

dose it work with n97

Now many people ask themselves what's the point of hacking their Nokia.Well you can install unsigned applications to your phone much easier, letting you have more applications. Simple!
Now you will ask "What if the nokia people want to check for it?They will find out that you have changed phone product code..."

Well ideally if nokia comes to know your phone is hacked, they might not give you warranty...they will simply put all the blame on you hacking the phone.
Also that the nokia guys should be smart enough to know that your phone is hacked!
In cases where your phone goes completely dead it doesn't matter whether it was hacked or not, since it would be simply flashed by them.
And there are  rare instances, where u would go to nokia care with hellox on your phone ....any person will just delete/uninstall it as formatting his memcard, or just pulling it out!

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Hope that information gave the answer to your question! 

how to use it??
does it work on my 5800xm v40.0??

Can you tell how to sign applications for 5800!