Ender 3 S1 motherboard V24S1_301 - HELP WITH PROGRAMMING

I have a V24S1_301 motherboard with an on board STM32F103 cpu. STM32F103 is blank (don’t ask me why). CPUs Boot1 is connected to ground via a 100K resistor.

CPUs Boot0 is connected to the switch. With the switch, CPUs Boot0 can be set to 1(high) or 0(low).

Now I need advice from someone who is good at software, to tell me, what should be the process of uploading Ender 3 S1 (PRO) firmware to the motherboard.

I also have a dlink-2 programmer.

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