Esp8266 sketch data upload missing2/15/2023 ![]() If flashing fails with random errors part way through, retry with a lower baud rate. Writing to Flash Fails Part Way Through Try using a slower baud rate ( -b 9600 is a very slow value that you can use to verify it’s not a baud rate problem). If you have connected other devices to GPIO pins, try removing them and see if esptool starts working. Check the voltages at each pin with a multimeter, “high” pins should be close to 3.3V and “low” pins should be close to 0V. A common pitfall is leaving a serial terminal accessing this port open in another window and forgetting about it.Ĭheck the chip is receiving 3.3V from a stable power source (see Insufficient Power for more details.)Ĭheck that all pins are connected as described in Boot Mode Selection. If you see errors like “Failed to connect” then your chip is probably not entering the bootloader properly:Ĭheck you are passing the correct serial port on the command line.Ĭheck you have permissions to access the serial port, and other software (such as modem-manager on Linux) is not trying to interact with it. Try the suggestions here if you’re having problems: Bootloader Won’t Respond Flashing problems can be fiddly to troubleshoot. ![]()
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