The chip shows up on SDIO when started in SD boot mode (MTDO pulled high), and has the serial bootloader running when MTDO is pulled low. Trying to download image via the serial interface fails and hangs the device, probably because the Flash is on the wrong interface for it.
Is there a way I can use the serial download protocol in ROM to program the Flash? I saw, in the 8H-ESP8266__Interface_SDIO_SPI_Mode__EN_v0.1 app note, that you have a way of doing it with XTCOM_UTIL. Can you share this version of XTCOM_UTIL?
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