Answers.Body: <p>I tried Lejos and removing the SD card and rebooting was enough to go back to original firmware.</p>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2013-10-09T05:42:07.753Z
Answers.LastActivityDate: 2014-02-22T10:35:02.767Z
Answers.LastEditDate: 2014-02-22T10:35:02.767Z
Answers.UserDisplayName: Jakub
Body: <p>I have prepared a SD card to run Lejos on EV3, as said on <a href="http://sourceforge.net/p/lejos/wiki/Creating%20a%20bootable%20SD%20card/">Lejos Sourceforge page</a> 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?</p>
  
  <p>Thanks for any information.</p>
  
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2013-10-07T15:37:15.913Z
Comments.Text: 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](http://www.lego.com/en-gb/mindstorms/mindstormservices/firmware-download-page/?assetid=%7BA4FFCBDA-FC2C-44F6-A876-B8A7DE7F2720%7D), I couldn't say.
Comments.UserDisplayName: Zhaph - Ben Duguid
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2013-10-08T18:31:12.683Z
Comments.Text: already tested it, right. removing SD card was enough :)
Comments.UserDisplayName: Jakub
Tags: <ev3>
Title: Is it safe to try different firmwares on EV3?
UserDisplayName: Jakub
ThreadText: # Is it safe to try different firmwares on EV3?
  
  (Asked by: username_0 on 2013-10-05)
  
  I have prepared a SD card to run Lejos on EV3, as said on [Lejos Sourceforge page](http://sourceforge.net/p/lejos/wiki/Creating%20a%20bootable%20SD%20card/) 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.
  
  **Tags:** ev3
  > **Comments:**
  > **username_1**: 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](http://www.lego.com/en-gb/mindstorms/mindstormservices/firmware-download-page/?assetid=%7BA4FFCBDA-FC2C-44F6-A876-B8A7DE7F2720%7D), I couldn't say.  
  > **username_0**: already tested it, right. removing SD card was enough :)  
  
  ---
  
  ## 1 answers
  
  ### Answer by username_0 on 2013-10-09. Score: 7 | Accepted answer
  
  I tried Lejos and removing the SD card and rebooting was enough to go back to original firmware.
  
  
  ---
  
  