Windows phone image designer requires an ffu file from the Lumia firmware website
Extract the zip file to C:\WPID andput the ffu in C:\
Use the 'start.bat' file to launch image designer
Power off the device and hold power and volume up until you see a lightning bolt
Open windows phone image designer and select :flash' and select the ffu file you downloaded
Tap on 'flash' and wait until it finishes
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