1. Windows Central Question's Avatar
    I've tried few time but it just won't install 8.1 on my lumia using windows device recovery tool. and one more question: does recovery tool rollsback to 8.1 or 8.1 update 2?
    11-13-2015 02:19 AM
  2. colinkiama's Avatar
    Try installing the drivers for it by plugging the phone in with the recovery tool closed then try again.

    Also, it will go back to the latest stable consumer release which is 8.1 update to for the 640.
    11-13-2015 02:55 AM
  3. emperor_skull's Avatar
    The recovery tool won't install, keeps showing hash value is not correct error code any solution?
    11-13-2015 03:12 AM

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