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Was going through a tutorial, and I forgot to enable I2C interface and load the I2C kernal module, as well as a few other things. I just want to get it back to the point as if I didn't configure anything, and I had just pulled it out of the box.

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Simply rewrite the SD card with a fresh copy of NOOBS or Raspbian and it will be back to brand new!

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Shouldn't the firmware be downgraded as well (to get the "out-of-the-box" equivalent)? – WoJ Jan 12 at 9:52
    
The "firmware" is stored as an file on the SD card. It is loaded before the OS loads. – CavRecon Jan 12 at 13:25
    
Ah, ok - thanks. I thought it was flashed somewhere. – WoJ Jan 12 at 13:36

If you're not afraid of losing any saved data, programs etc. then why not just reformat the SD card and load a fresh copy of your preferred OS?

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No need to flash everything again. Just do sudo raspi-config and choose "Advanced settings" there you can enable I2C.

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