I finally got around to unlocking a Lenovo Thinkpad Edge E540 I was given a couple of years ago, must have been why I joined the forum back then.

I thought I'd add some further information, as its not completely clear, and the link above is now broken.

I didn't need to disassemble the laptop, just remove the rear cover, the chip is partially hidden, so with a little Googling and trial and error I worked out which pins I needed to connect.

The chip is located as per below.

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