Only saying this because you said yourself you are a noob :wink:
Just make sure you save your key from your original ms25 and then flash it to your new ms25.
The key is the dummy.bin that you will save using jungleflasher.
Don't think that you can just open up your xbox switch out the sammy's and that everything will work. You need the key from your original to be put on your new one and then everything will work normally.
I don't know if you needed this info or not, but hope it helps!