Bricked 635: Rising from the dead


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Sep 14, 2013
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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
But I would get the same error as above.

Then I decided to try with different FFU file from here 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)
This is what WDRT downloaded

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

Martin Velikov

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Feb 19, 2016
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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?


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Jan 27, 2018
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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 ? :unhappysweat: Thank you

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