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By picstart
#76974 I second this. I have only once bricked an esp8266 and it was by feeding it 5v instead of 3.3v. now it is possible to have code that can cause the system to reboot or reboot repeatedly upon power up but the esp has always have accepted a new code upload that fixed the issue. The pin configuration for upload is fixed but the newer boards Ex WeMos use the uart on the dev board to set the pins in the correct state for an upload EX Arduino upload is pretty much error free with the WeMos dev board. For other boards the manual pressing of the boot and reset pins in the correct order is needed some boards require unpowering the board before uploading with the correct boot reset pin presses or even jumper selections.