{"NAME":"Sinilink XY-WFBJ","GPIO":[0,0,544,0,7584,224,0,0,608,640,32,0,288,0],"FLAG":0,"BASE":18}

You cannot use a regular tasmota.bin file. You have to compile by yourself with

#define USE_RTC_CHIPS
#define USE_PCF85363

You can find the pins for flashing near the ESP chip.

Starting with the square on top:

• VCC
• RST
• GPIO0
• RX
• TX
• GND

Use an external power supply!