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    so a question without code, an answer without code. nobody could answer your question if the problem was in the code you didn't show. how should this be useful as Q&A? add the code or delete the question please Commented Nov 29, 2020 at 6:54
  • The reason why I didn't post code with my question is that I thought that the error was on the conceptual level, and so I saw no point in posting kilobytes of code before clarifying whether the underlying procedure is actually correct. I did add the code that fixed my implementation to my answer now, though. I do think that this question might be of relevance for someone facing a similar undertaking, if only to compare and verify his approach. Commented Nov 29, 2020 at 17:57
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    now I understand what you do. it would be simpler to work with a binary of the sketch, not with hex file. github.com/jandrassy/ArduinoOTA/blob/… Commented Nov 29, 2020 at 18:02
  • Yeah, that would've been better. But since initially, I didn't know how to go about, I just followed some online examples and tried to mimic the resulting behavior of avrdude as closely as possible. I am smarter now. Commented Nov 29, 2020 at 18:08