Hello ; You did nothing wrong, probably a misunderstanding of the process, please consider that we can only assemble the parts which are available on our [Parts Library](https://jlcpcb.com/parts) that you can check through the following link : [https://jlcpcb.com/parts](https://jlcpcb.com/parts) Please consider carefully that you need to check parts availability only through the [Parts Library](https://jlcpcb.com/parts) link because that's the main reference for our assembly system, means when you upload your BOM file the parts availability will be checked from our Parts Library and not from LCSC or EasyEDA. One more tip about parts availability, maybe you make your design today and you finish it a week later then you can reserve the parts that you need right from the moment you start designing and then when you place your order you get them ready, this is possible by adding parts to your own Parts Lib. more details here : [https://support.jlcpcb.com/article/164-what-is-jlcpcb-parts-pre-order-service](https://support.jlcpcb.com/article/164-what-is-jlcpcb-parts-pre-order-service)<br> <br> Thank you.