[Q] Phone stuck in a boot loop, plus other problems

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http://forum.xda-developers.com – My phone, HTC Sensation XE, is S-ON, on default ROM, and has HBOOT 1.29.000. Needless to say, my phone is not rooted. The phone is on a boot loop ever since I last took off the battery and placed it back. I sometimes get a message that my Android system is getting upgraded, terminating with an error "System UI has stopped working" before the phone restarts itself again. I don't know if this is a hardware issue or software. How do I get my phone to a normal state? I don't mind rooting the phone if I need to for the purpose of installing default/custom ROM. But I don't know if th (HowTos)