Non-volatile memories with camera settings (ROM, serial flash, MPU eeprom) are updated on successful shutdown, to my knowledge. Having something that works in the emulator decreases the odds of getting into trouble, and during these early boot experiments, I'd say the bricking risk is fairly low - should anything go wrong, the camera will most likely not boot. Sure, at some point you will want to try the code on your camera. Besides, the emulator shows a LOT of internals that are not obvious when running the code on the camera (at this stage, you'll most likely see a black screen and you'll wonder why it doesn't work). That way, the risk of bricking the camera drops to zero (as you will not experiment with real hardware, but with a PC-based program). The best way to start learning, in my (biased) opinion, is to use the emulator.
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