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# 1.3.2 SPI Bootloader system level execution flow

Bootloader system level execution flow

- The Bootloader code starts executing on a device Reset

- If there are no conditions to enter the firmware upgrade mode, the Bootloader starts executing the user application

  - Refer to Bootloader Trigger Methods for different conditions to enter firmware upgrade mode

- The Bootloader performs Flash erase/program operations while in the firmware upgrade mode