You can, and if it gets hard bricked, a warranty repair is out of the question. The best option if that happened is to go to the carrier and play stupid.
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Daily Driver: HTC ONE X(L) Evita T-Mobile
Tablet: Nexus 7 (2012) Grouper
I AM N00B FRIENDLY! ASK ME ANYTHING!
LG Optimus V (Still miss it)
Samsung Galaxy Player (Replaced and gave to Mom)
iPhone 4 (Broken, will be repaired)