ESP32-WROOM-32 Flash update question

[ramvij30]

Could we do the ESP32 firmware update through HSPI bus from our Master with ESP32 being a slave in our system ?

[costaud]

There is HSPI driver for slave mode in the esp-idf.
And there is a OTA example.
I think it's feasible, you can try to combine those two thing to realise this function.