Thanks very much for your message, for your questions,
1. We offer software activation if you buy the tool with software. Also when you use the device with software to work, if meet any problems of the device or software, can contact us. But we do not offer any technical skills on doing cars.
2. We offer one year warranty, this means we offer free repair in one year, but not including other cost like shipping or extra cost from factory.
3. For warranty, you can contact us directly.
4. All of our tools are from China.
5. our SD C4 and SD C5 can support Mercedes Benz Unimog and commercial trucks.
6. We offer the device with OBD cable, lan cable, 38pin cable, 14pin cable, and 8pin cable.
7. For our software, if you choose windows 7 version, it come with HHT-WIN, can support old mercedes cars from 1989.
8. For control unit programming, it may needs online scn coding, if choose our 2020/03 software, it can support, but you need to have original online account yourself.
9. You can tell us how many and which device you want, we can check discount price for you directly.
10. For update, it is mainly for software, but if ther is new software released, need to buy new hard drive for new version software.
11. If you do not update, you can still use it to work, no problem.