Go to the link below and scroll all the way down to the ANNEX SECTION!!!!
As screen captured below; follow the instructions to the letter!
You will be doing this from a Flashrom FreeDOS USB; so you have to ENABLE Compatibility Support Module (CSM) in the BIOS before it will boot into the DOS drive!!!
Now get to it read the relevant section and get on with it. This is why I cited the procedure in the FIRST POST!!! 
Cheers 
Hans
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