I might be completely wrong, but I’ve built my custom based on ideas from cheapino and in my opinion, tompi made a mistake when designing the RJ45 connection. When I copied his design, I ended up with one of the rows connected to ground on the other half. To amend that, I made a custom cable. You can see how he’s trying to make it work by adding some bitmasks with functions like fix_ghosting_issue, but it’s not a ghosting issue per se, but a mistake in wiring. You can check that with a multimeter running on continuity check mode. I haven’t been able to make my keyboard work properly before making a cable with four wires reversed, so that the connection is correct.