Thanks for explaining that.
The firmware by itself isn't going to get me anywhere. I need thorough instructions. Click this, then this, then this, not a bullet-point list. I'm about to be in possession of an FT-5 and a BL-Touch, but I don't know how to make them talk to one another.
If instructions for ABL haven't been posted yet, then on behalf of all future FT-5 owners I would like to request that someone knowledgeable please consider drafting some. It would be fantastically useful for all of us noobs. I've seen a surprising number of folks who have selected the FT-5 as their first printer.