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By btidey
#92739 If you use the generic settings for ESP8266 boards then that has lots of settings which must be correct for the board you use. In particular you need to select the right Flash memory size (1MByte for ESP-01).

Or you can do yourself a favour and use an integrated board like a Wemos D1 mini which plugs straight into a USB port, is much more capable than an ESP-01, and is still pretty cheap.