If you do anything to your phone the warranty is voided.
1. If you unscrew the screws and dont replace the white tabs - void.
2. If you drop the phone and it has any marks on it - void
3. If you mod the phone with different parts (even if you replace the white sticker) - void
4. If the phone gets wet - void
5. If the phone gets bricked and even has a micro scratch on it - void.
6. If you breath on the phone - void
7. If you use the phone - void
8. If you take the phone out of the packaging - void
9. If you think about buying the phone...and actually do - void.
Basically, any way they can say you have voided the warranty they will. If you arent scared of dissecting your phone, then do it. It is REALLY hard to destroy this piece of equipment. Most of the pieces are modular and can be replaced...with the exception of the main board, which I dont know how you could possibly break with the exception of a lightning strike.
If you arent scared of it...have some fun....
...and LEARN TO USE JAVALOADER and you will never have a sw problem again.