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Common RUU Errors:

Error 120 : Main Battery Low Charge your phone to 30% or more and try again.
Error 131 : Customer ID Error You are trying wrong region rom. Make superCID or use GoldCard.
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RUU stands for ROM Update Utility. In general the update procedure is, install HTC Driver, Connect your phone to Computer in Normal Mode or Fastboot Mode, Run the RUU and follow instructions...