Older Tesla Model 3 drives on Hardware 4 with potential Ryzen bundle path

A team led by Tesla hacker Michał Gapiński has successfully retrofitted a 2022 Tesla Model 3 with the company’s latest Hardware 4 (HW4) computer, getting the car driving and at least one HW4‑era camera fully online. The modified car moves under its own battery output, and its center display now displays live feeds from an updated camera sensor.

Technical process behind the computer swap

The upgrade project required three primary steps to complete the assembly. First, the team swapped out the older Hardware 3 module for a genuine Hardware 4 unit. Next, they applied software adjustments to the electronic control unit so the newer board could communicate with older vehicle systems. Then, they attached custom camera adapters directly to the original harness, which prevented technicians from having to pull new wiring through the cabin.

The physical casing of the Hardware 4 computer is slightly taller than earlier builds. Gapiński used a temporary combination of epoxy and zip ties to secure the case, but he stated that mounting hardware from a newer Model 3 Highland chassis could fit if technicians drill fresh holes.

Current vehicle status and system warnings

The car functions on the road, but several active alerts remain on the diagnostic screen. The primary touch screen shows a warning stating that braking functions may be limited, and the service menu registers seventeen separate diagnostic alerts. The team still has calibration work left before every onboard driver assistance capability runs properly.

Elon Musk stated during a previous company earnings call that Tesla would eventually have to upgrade older Hardware 3 units for customers who purchased the full self-driving package. Meanwhile, earlier teardowns conducted by industry researchers indicated that different casing sizes and extra camera ports would prevent easy computer swaps on older model years.

Gapiński proved that earlier vehicles can talk to Hardware 4 components without replacing every single factory wire loom. He mentioned that Tesla could package this computer swap together with an AMD Ryzen infotainment board replacement for cars originally built with older Intel Atom processors.