How do I edit an FFU to change a few signature verification values?

Tiago117

Member
Jan 10, 2019
48
1
8
Hi,
I have a Lumia 1020 with a corrupted boot. A few years back I installed Windows 10 Mobile on it by changing a few registry keys that make it seem like my Lumia 1020 is actually a 950XL. Something like this, using interop tools: https://www.windowsphonearea.com/install-redstone-3-builds-unsupported-windows-phones/
But now my phone bricked itself and is in a constant loop of "Can't find bootable option. Press any key to shut down.". I can't access it, it doesn't start and is always stuck here.
Every time I try to flash anything with WDRT (Windows Device Recovery Tool), WPInternals or thor2 I always get the same error message: signature error and authentication problems. Meaning, the registry values that I once changed are now stopping me from flashing the phone because it is half Lumia 1020 and half Lumia 950.
Is there a way to change these verification values on an FFU file so that is accepts my phone? Opening the file and adding the Lumia 950XL values to it so that I can flash it to my phone? How do I do this?
Thanks.
 
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