Thinkpad X230T - need help reflashing bios to install X220 keyboard

So, I have replaced the keyboard of my X230T with one from the X220T. Unfortunately, some of the keys do not work, but this can be solved with a bios flash.

This would involve patching the official Lenovo bios update ISO. The problem that I'm facing is that I have no idea how to patch the ISO. It involves using tools from git repository, which I have never done and really have not found any helpful tutorials for a noob like me.

If possible I am looking for someone to help me patch the iso for the X230T and make it available for me to download - or if anyone can point me towards a tutorial to patch the ISO on my own.

Here is the link to the files: http://ift.tt/2bR6CM8

Thank you in advance!

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Thinkpad X230T - need help reflashing bios to install X220 keyboard