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By water
#70781 I want to replace a >32Mbit SPI flash(e.g W25Q128) on ESP8266 module with ISP bus connected,not HSPI external, is it work?
the normal firmware v1.9.2 is support it ?
how biggest size of SPI flash supported in ESP8266 ?
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By QuickFix
#70787 The ESP8266 supports a maximum of 16MB (= 128Mb), so you can't upgrade your board with anything larger than a 25Q128.

If you need to store more data (for instance images), you could opt for an SD-card connected to HSPI. :idea: