"self downloading" firmware via USB

[PNova.2]

Hello
is it possible for the microcontroller with USB OTG to download the program memory from the USB stick itself?
In other words, change the firmware simply by connecting a USB stick with a .bin file and perhaps by resetting the component.

So far I have solved it using two MCUs. One only reads the .bin file from the USB and then uploads it to the target device via the usart bootloader, but this seems too impractical to me.

[Andrew Neil]

Sure - it's just a way to get the data into the microcontroller.

[MM..1]

If you ask for system boot solution then no, But you can use own bootloader for this...