Ordering from JLCPCB

When you order from JLCPCB, upload the Gerber files located in the repository folder of the board you want to make. The following should auto-populate after it's done uploading (the listed dimensions for any of the lithium-ion boards may be slightly different than this screenshot):

Make sure it detects the board as 4-layer!

Now, follow the screenshot below to complete the PCB options (you can choose the color you want).

NOTE: The screenshot shows ENIG as the surface finish. If you are using tactile switches (clicky buttons like the GBA SP had), then you can choose HASL, but the finish will be silver instead of gold. I find ENIG easier to solder parts on. ENIG must be selected if you are not using tactile switches.