The flash memory capacity of a microcontroller is typically not replaceable, as these are built as a System on a Chip where all components required by the system to run are built directly into the device.

There are instructions available online on how to allow addressing of up to 4MB of external RAM connected to the board's SPI interface, but this comes with various limitations. [1]

[1] https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-guides/external-ram.html
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