The standard set: commercial invoice, packing list, bill of lading, export customs declaration, certificate of origin, and a copy of the vehicle title/registration. How to verify: the bill of lading number should be trackable on the shipping line's website; the certificate of origin is verifiable through CCPIT's online system; and the VIN must match across all documents, the inspection report, and the car itself. Ask for scans of everything before paying the balance, and have a freight forwarder review the set. Mismatched VINs, missing title copies, or vague promises that "documents will follow" are red flags worth pausing the deal over.

Once the car system (especially in a closed ecosystem) undergoes a major version upgrade, its bootloader is usually locked, preventing downgrades. If this happens, there is basically no solution in an overseas environment. Therefore, we strongly warn: do not blindly insert a USB drive to upgrade while offline.

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 blindly modifying the electrical systems of modern integrated circuit vehicles.