UART file transfer

[pepopi]

Hello everyone,
I'm doing a project in my university and I need to program a ESP32 with another ESP32 using UART. The firmware is previously stored in SPIFFS in the "master". What I don't know is how to transfer the bootloader.bin, partition.bin and firmware.bin to the "slave" ESP32. I know there is another topic that treats a similar matter, but that topic has not been enough to understand it.

Thank you in advance

[ESP_Sprite]

https://github.com/espressif/esp-serial-flasher

[pepopi]

Thanksfor answering so fast. In the link you sent there is an example of what I'm trying to do but I'm doing the project on the Arduino IDE. Furthermore, is the bootloader customized or is it the default bootloader?

Thank you

[ESP_Sprite]

No such thing as a 'customized' bootloader on the ESP32 platform as the bootloader is in ROM and you cannot change that. (At least, when it comes down to the bootloader code that handles flashing.)