ESP8266 Community Forum

- Mon Dec 10, 2018 8:05 am #79493 Checksum error indeed means that the upload of the firmware failed somehow.
Try at a lower baud rate (like 9600 Baud) and if that doesn't work see if GPIO0, GPIO2 and GPIO15 are as they should ("UART-mode" when flashing):

ESPModes.png

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Assumption is the mother of all f*ckups. At least: that's what I'm assuming.

- Mon Dec 10, 2018 3:06 pm #79503 I received about 15 of these chips and cannot program any of them using my programming setup. None of these new chips will boot. But I can program and run older chips of both types (with two LEDs and only the single Blue LED). So it feels like this batch of chips is bad and I am curious what you folks think. Thanks.

- Mon Dec 10, 2018 5:25 pm #79504 I once had a batch of esp modules which wouldn't flash successfully QIO mode but flashed OK in DIO mode. This was probably due to a different flash chip or how it was wired.

Might be worth trying DIO mode to see if that makes a difference.

- Tue Dec 11, 2018 12:06 am #79509 Think I resolved my issue. I must have specified the wrong board, changed to the following and was able to program all the chips and they boot fine. Very strange problem as I received two chips today on a single order and one worked while the other did not. Once I changed the board type in the project and went to dout for the flashing, everything seemed to click.

board = esp01_1m
framework = arduino
board_build.flash_mode = dout

Thanks for the help!