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Step 1. Check hardware wires

The Cactus Micro Rev2 has connected esp8266 module as the bottom table. You don't need make any change.

ESP8266 Cactus Micro Rev2
GPIO0 12
RX TXO (Serial1)
TX RXI (Serial1)

Step 2. Program the programmer sketch

We wrote a sketch esp8266Programmer. For upgrade firmware for esp8266 module, you should open Arduino IDE and upload the sketch.

Step 3. Download tools and upload firmware to esp8266

If upload failed, please press the reset button on Cactus Micro Rev2 and try again.