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I have prepared a SD card to run Lejos on EV3, as said on Lejos Sourceforge page and I'm about to test it. What worries me - will I still be able to go back to original Firmware if something goes wrong or I'd like to go back to this original Lego visual building software? Will removing SD card be sufficient?

Thanks for any information.

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You should be able to switch back to the original firmware without too much trouble - whether it's as simple as removing the SD card, or if there's a more involved process, I couldn't say. –  Zhaph - Ben Duguid Oct 7 '13 at 15:37
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already tested it, right. removing SD card was enough :) –  Jakub Oct 8 '13 at 18:31
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up vote 4 down vote accepted

I tried Lejos and removing the SD card and rebooting was enough to go back to original firmware.

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