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    This is definitely possible. Bootloader is just a program which can communicate whatever hardware is available and write memory and jump to it. Commented Feb 19, 2019 at 16:03
  • This should be possible by adapting the serial bootloader typically used on the ATmega328p (etc) to your ATmega32u4. The details of doing so however do not really fit in a question on a Stack Exchange site unless you explain a specific difficulty. Make sure to do some searching, it is quite possible someone has already done this project. Also consider if switching to an Arduino type board that simply has an ATmega328p (especially a compact one without a 2nd chip as a USB bridge, though you can bypass that) might be the simplest route to fill your need. Commented Feb 19, 2019 at 16:22
  • Makes sense, thanks for your answers, sorry I did make a search for that prior to asking but couldn't find any simple answer to this question. Commented Feb 19, 2019 at 20:38