Download partition from ESP32 to local .bin file

[jumjum123]

ESPFlashDownload is used to download a local file to ESP32.
I'm looking for the other direction, I need to download a data partition from ESP32 to a local .bin file
The .bin file, ceated this way will be downloaded to other ESP32, or to the same ESP32 after erasing flash.

[kolban]

I'm not familiar with "ESPFlashDownload". Is that similar to esptool?

Using esptool we can retrieve data from ESP32 flash.

For example

esptool read_flash {address} {size} {targetFile}

will retrieve data from a serial connected ESP32 at offset address for size bytes and write it to the given file. Is this what you are perhaps looking for?