Default HTC sensation Z710e viperc2 flashing guide

Hey folks can I flash vipersc2 on HTC sensation Xe with 3.32 firmware, stock ruu with 3.33 firmware its too large its there any other way to update the firmware, is it possible to back up my friend's HTC sensation Z710e Rom cause its 3.33 firmware and restore it on my phone, then flash the vipersc2 custom Rom

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