1. AV2RY's Avatar
    Just input if somebody needs it. I spent hours trying to downgrade from W10M then trying to turn the phone on.

    I have Lumia 635 AT&T (unlocked). It was working great, I think, wasn't using it at all. I installed W10M with latest update that came out last week or so. It was working fine but I didn't like it and wanted to go back to WP8 with WDRT. WDRT downloaded all files needed, but during installation would immediately fail to Operation Ended With Failure (tried two cables + 4 USB (2.0 & 3.0) ports). After many attempts my laptop started downloading some "critical" driver. When I though "finally, getting something" .. I did .. bricked the phone with ERROR: Unable to find a bootable option. Press any key to shut down. Nokia Software Recovery Tool didn't even see my phone, and NaviFirmPlus wasn't even launching properly.

    I tried these instructions with already downloaded files by WDRT with all USB ports http://www.lumiafirmware.com/info
    But I would get the same error as above.

    Then I decided to try with different FFU file from here http://www.lumiafirmware.com. Following the same CMD instructions with the first try everything went smooth. Phone is working just fine, so far.

    While I was typing this I realized the file WDRT downloaded was not the same version I had before upgrade to W10M.
    This is what I had before upgrade (and installed again) http://www.lumiafirmware.com/ser/RM-975/guid/059W380
    This is what WDRT downloaded http://www.lumiafirmware.com/ser/RM-975/guid/059V714

    I'm guessing WDRT doesn't always download the "right" files. (It did for 925). Wasted hours on this, and read many instructions from here (WC), MS, xda-developers, and more..

    PS. Don't just download FFU file, download all files
    bortovic likes this.
    06-27-2017 02:33 PM
  2. realwarder's Avatar
    Thankfully you got the phone working again :)
    libra89 likes this.
    06-27-2017 05:08 PM
  3. Martin Velikov's Avatar
    Hi, do you know if there is a change this message "ERROR: Unable to find a bootable option. Press any key to shut down" to be damaged motherboard? Can you give tutorial for manual installation of ffu files?
    12-22-2017 04:07 AM
  4. robbiefpi's Avatar
    Hi all, I have the same problem of unable to find message for a Nokia Lumia 625.
    Following the istruction on lumiafirmware I obtained these messages:

    Send of FFU header failed!
    [IN] programSecureFfuFile.
    programming operation failed!
    0xFA001106: Signature check of FFU file fails. Reason(s): The FFU file is not co
    rrectly signed or not signed for this device.

    The product code is correct and the firwmare FFU the same... What is wrong? Please can anyone help me ? Thank you
    01-27-2018 08:26 AM

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