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UART Bootloader

Hi,

in our application we will have a main MCU and a second MCU, an nrf52832.

We need to update the fwon the nfr52832  from the main MCU using a bootloader, via UART.

I'd like to have an estimation of how long will take via UART to erase the fladh, program and verify (considering 512 KB of flash).

Which is the buadrate ion UART ?

Does anyone an inidication of how much time will be needed ?

Thanks

Best regards

Emanuele