As shown in the schematic, ... To program the STM8, you can use either the SWIM interface, or disconnect the ESP8266’s power pin, switch up the TX and RX wires, ...

I too had the problem of pinout,which is not the same between 5050 and 3535 leds. Fortunately you can rotate the led. The pinout is less than ideal, but you still can have the four pinds touching ...