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By jankop

But I see one major problem there. The 3.3V source is enough for programming, but not enough for WiFi operation
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By Fabri54
#91188 I believe it's the same concept. Your TX transmission from Arduino IDE must be received by the RX of the ESP8266 and viceversa. I've programmed a few ESP8266-01S with an USB converter and I crisscrossed the TX and RX signals. Of course it depends from the USB converter.
For my ESP8266-01S I've tested two USB converters. One is a compact one with an USB A connector and an 8 pins socket where the ESP8266-01S fits without wires. In this case I believe the crossing between TX and RX is done at PCB level. The other one is less compact with a mini USB connector and pin headers. This latter needs to physically cross the TX and RX with the ones of the ESP8266-01S module