You will need to confirm the COM port shown in Putty is the same as your serial adapter, you can check Window’s Device Manager under Ports for that. Baud rate needs to be set to 115200, then you will name it and click save. Once the tool is connected, select the name and click load. Boot the VIM3 and let it boot for a log. Or once the VIM3 starts booting, press the space bar on the PC to interrupt the boot. In Putty’s output, you will see a prompt, there you will enter KBI and press enter. From there all KBI functions will be accessible.
I just covered this on the Edge, will be very similar on the VIM3(Baud rates are different for Edges). Have a look at this post.
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