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# 1.7.2.2 USB/UDP Firmware Update mode execution flow

Bootloader Task Flow

- Erases the Flash memory

- Programs the hex file records into Flash memory

- Jumps to the Application

- Calls the DataStream Task at end of its every state machine execution to receive any packet from the Host PC

DataStream Task Flow

- This task is used to receive data bytes from host PC and to send response to host PC

- It notifies the Bootloader task on completion of Data Reception or data transmit through callback