We will directly check the registration certificate (the big green book) and count the number of changes.

Yes. We will apply to customs or the trade promotion agency for a specific version of the certificate of origin (such as ASEAN Form E, China-ASEAN FTA certificate, etc.) to assist you in legally enjoying significant or even zero tariff treatment at the destination port.

It's extremely difficult. Unauthorized modifications can lead to module current overload protection, resulting in a lock. In China, you need to use the factory online engineer account to reprogram it. It's basically impossible to perform online decoding overseas. We strongly warn against blind electrical modifications on modern integrated circuit vehicles.