The ESP requires at least 150mA, many 3.3V serial programmers do not supply this much current as many serial programming tasks do not require a large amount of power.
Many CH340G devices will not work, the "golden CH340G" has a voltage regulator on it to supply enough power to the ESP device - many do not. Some devices, such as NodeMCU, D1 mini or M5Stack products, have a USB upload port and the serial-to-USB adapter built in. You MUST make sure the data (RX and TX) and VCC pins are set for 3.3V. Some adapters can be switched between 3.3V and 5V for the data pins, but still provide 5V on the power pin which will irreparably destroy your device.
RaspberryPi - only for advanced users. NodeMCU You can also use a NodeMCU (or similar) as a reliable serial-to-USB adapter if you disable the onboard ESP by bridging GND to the RST or EN pin, and connect TX and RX straight to another ESP82xx instead of crossed. CP2102 or PL2303 - works with certain devices, but using an external 3.3V supply might be necessary. Buy only the variant with a separate 3.3V regulator on PCB! FTDI FT232 - these adapters have a lot of fakes in the market so buy only from reliable sources ( example). RECOMMENDED CH340G is the most reliable and the cheapest one to boot ( 1, 2). 
You must ensure that the device receives sufficient power (current AND appropriate voltage level) to properly flash the firmware on the device. The power supplied to the device is one of the most important elements for both flashing the device and for stable operation. Getting Started Prerequisites ~ Needed Hardware ~Įvery Espressif ESP8266, ESP8285, ESP32, ESP32-S or ESP32-C3 chipset based device can be flashed with Tasmota.
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