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Ota on 1MB devices

ESP always boot from app image. During OTA rest of flash is used as temporary buffer to perform OTA.

So on 1MB chip the real usable space can be:

Workaround is to perform 2 step update:

  1. Flash with smallest possible image
  2. Flash final image (up to 600kB)

After flashing AP with SSID name like ESP-C06F65 will be setup. There is no auth.