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I was having a sketch but I accidentally downloaded a file which was containing a virus. That virus deleted all my Arduino sketches. I uploaded a sketch into my Arduino UNO and it is still in there. Is there any way to get it back?

Reyansh Shivnani
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    No. The sketch is not on the Arduino. The compiled binary code is on the Arduino. The sketch is gone. Don't you have a backup?! – Majenko Oct 29 '21 at 10:34
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    As Majenko said you can never get the original sketch back from the Arduino, since it is compiled first to assembler and then to binary machine code. You can only get back that binary machine code. Then you can use a decompiler to get a corresponding assembler code. Though that won't be anything like a sketch. Especially the symbols (variable names etc) are totally gone. And it sounds like getting the machine code won't help you. – chrisl Oct 29 '21 at 10:37
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    Like the others said. If you lost something you put a *lot* of effort into, it may be worth taking the time to run something like [TestDisk](https://www.cgsecurity.org/wiki/TestDisk) to scrape the drive for chunks of text and then and grep the results for Arduino-related substrings, e.g. "Serial.print". This assumes they haven't been overwritten. If you try that and have questions about it, it's probably in the domain of [superuser](https://superuser.com/). If you had a complex project, the odds of success and required effort *might* be worth it. It wouldn't be particularly fun to do though. – timemage Oct 29 '21 at 17:11

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