I own two HW4 2026 Model Y's - I use FSD all the time. Having followed Teslas press history over the past decade, I have zero belief they will upgrade HW3 cars to HW4, and certainly not for free. I'm curious - Why do you feel like they would do either/both? (Upgrading HW3 to HW4 parity would require new computer, all new cameras, an additional camera at the front bumper, various new matching wiring harness and plumbing for cooling, etc)