E-01 USB flashing tool
The E-01 module is not very breadboard friendly. So we have a special E-01 USB flashing tool at the commons|lab. The module can be used to flash the E-01 with the ESPtool program or directly from the Arduino IDE.
Be careful to use the correct polarity! Insert the E-01 module according to the illustration on the right. The E-01 module must not stick out, but must sit entirely on top of the flash tool.
Entering the Bootloader Mode
In order for the E-01 module to enter the bootloader mode, the button on the bottom side of the module needs to be pushed while being inserted into the USB port.
Once the E-01 module has entered the bootloader mode, only the red power LED lights. The blue LED flickers once while inserting into the USB and remains off until the flashing process starts.