Bootloading
From Wiki at Neela Nurseries
2022-08-01 Notes on bootloaders for microcontrollers
A starting point, which links to five articles on differing bootloading approaches:
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13 Aug 2019 by François Baldassari
2022-08-03
What is a serial bootloader and how is it used?
Following link gives Silabs example, but is not a good general explanation:
Atmel bootloader:
STMicro bootloader: