Doesn’t de-branding screw your warranty?
Possibly, although if it is not completely dead, you can always reflash the original one back on. If it is so broken that you can’t reflash it, then no one will know anyway.
There is a slight risk of making it go bang in the debranding process, but if you charge the phone up and follow the instructions it is fine. Lots of neat little hacks you can install too – like on mine the battery indicator has a circle showing the fullness, but also a little number in the middle which shows the exact percentage of battery left, also you can uninstall rubbish built in applications that you don’t need (like stocks), and make sure you always get the latest software updates even if they’re not officially released for your phone yet.
Joe