When it flashes, it will go to 100% then your device will restart, the RUU will throw an error but just click the exit button, and all should be well.
Check the bootloader version now!
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O2 HTC HD2, O2 Xda Guide, O2 Ignito, O2 Orbit 2, Acer beTouch E100, Acer M900, Acer DX900, Glofiish V900.