If it is ISP online (on board) burning, please specify the required chip interface (such as JTAG, SWD, UART,...), need to submit the following documents, our engineers will contact you in time, please help prepare;
1: ISP and wiring diagram
2: Schematic & gerbe files (schematic), and
3: Power supply voltage of PCBA
4: The approximate power consumption of PCBA (current size), and
5: PCBA power supply interface and description (power supply interface description)
6: Is the function of PCBA provided normal?
7: Provide test files for verification (test files (firmware burning))
8: Description of special control signal during ISP burning
9: Other special considerations