Our bootloader PC program, BLPro.exe, now sees that the bootloader device that it knows how to talk to has come back, so the program has opened this device for I/O again.

We are now ready to use the bootloader (again), possibly to perform an upgrade of the firmware in the field.

We could repeat the steps in these tutorials over and over again as much as we want, switching the device back and forth between running the bootloader and then programming and running the target device firmware.

As long as we have some special code in the target firmware to jump to the bootloader at the appropriate time, the switchover process is easy and reliable.