If you are using a generic ELM327 dongle, you can select "Proceed without code" to use basic free features, though you won't have access to the full "Advanced" or "Professional" toolsets.
Determined attackers may attempt to reverse‑engineer the activation logic. While no system is foolproof, employing strong encryption, server‑side validation, and regular key rotation makes large‑scale cracking significantly harder. Garage Pro Activation Code -