Hello,
I am unsure if you still perform UEFI mods for the Lenovo Thinkpad X240, but I've recently acquired one and managed to dump the UEFI chip using a CH341A programmer, as suggested. I'd be very grateful if you could take a look at it, unlock the hidden menu and remove the whitelist, as I'd like to install an unauthorized network card.
I've shared the UEFI dump alongside a SHA256 hash for verification on Google Drive. Please find it here:
https://drive.google.com/open?id=1wMjt7QKmNUyzu9escBy-QZdiVGUPkHkd
Thank you in advance.