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  • 2
    From everything I've read, the first option is not recommended. Options 2 and 3 are fine. Commented May 10, 2014 at 5:01
  • 2
    @sachleen: Please say more about that (opt-1). Commented May 19, 2014 at 14:14
  • 2
    Option 1. or a variant can be a clean enough way to do this as long as power on transient conditions are designed for. Commented Feb 25, 2015 at 12:32
  • 1
    It should be noted that option 2 does not run the bootloader. Commented Aug 13, 2016 at 19:57
  • 2
    Option 3 works only with bootloaders that have WDT enabled. It puts board into reset loop otherwise. Commented Mar 28, 2017 at 15:22