We use two steps: 1. Insert a medical-grade endoscope through the spark plug hole to visually inspect cylinder wall scratches and carbon buildup on the piston top; 2. Extract an engine oil sample to check for large metal debris or emulsification (caused by coolant leakage).

Please take timestamped photos and videos at the first opportunity when picking up the car at the destination port (before leaving the port area). We will compare these with the final archived images taken at the Chinese port before shipping. If it is confirmed that we missed reporting it during the pre-shipment inspection, we will provide compensation for parts or labor costs based on the severity of the defect; if it is new physical damage incurred during shipping, the insurance claim process will need to be initiated.

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.