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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@MaBe
Yes, the AI Thinker work great with qio, check this page for details on flash_mode.
I was testing some EPS01 which gave me a hard time too.....
Result: some work with dio and some only with dout
That's why you can add some flash setting with make
ET_FM= valid values for flash mode are qio, qout, dio, dout
ET_FS= valid values for flash size are 256KB, 512KB, 1MB, 2MB, 4MB, 2MB-c1, 4MB-c1, 8MB, 16MB
Check this page for further details