1. Windows Central Question's Avatar
    I recently updated my Lumia 630 to Windows 10 TP but now i want to go back to Cyan/Denim. The thing is that both Windows Phone Recovery Tool and Lumia Software Recovery Tool gave me an error.
    The WPRT recognize my Lumia but when is "Reading phone information" it says Unknow error ocurred...

    Value Cannot Be Null.
    Parameter Name: string

    Don't know what to do to downgrade!
    Thanks in advance!!, sorry for my english.
    02-21-2015 06:34 PM
  2. RumoredNow's Avatar
    Here is a persistent user who recovered his 1520 from a Win 10 Hack Mod. Try what he did.

    aximtreo likes this.
    02-21-2015 08:35 PM

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