Has anyone ever reflowed this lead-free BGA while using lead solder paste?
Welcome to the technical forum. I did not find any information on the Lattice website on this. Just the standard Solder profile. The guide to the surface mount soldering is on this link: https://www.latticesemi.com/en/Support/AnswerDatabase/1/3/8/1385
Hopefully someone has tried this and will respond.