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The implementation internally uses sector erase to wipe everything except the sector(s) that mboot lives in (by erasing starting from APPLICATION_ADDR). The erase command can take some time (eg an STM32F765 with 2MB of flash takes 8 to 10 seconds). This time is normally enough to make pydfu.py fail with a timeout. The DFU standard includes a mechanism for the DFU device to request a longer timeout as part of the get-status response just before starting an operation. This timeout functionality has been implemented here.