https://devzone.nordicsemi.com/f/nordic-q-a/101198/how-do-i-change-sdk-and-toolchain-versionsI changed to SDK v2.4.0; I having some build problems so I want to go back to V2.3.0. How can I do that. Also I think my v2.4.0 SDK is somehow damaged; Is there a way ro &quot;refresh&quot; it. Or to just reinstall it? Regards, Jerryen-USTelligent Community 13Mon, 26 Jun 2023 08:49:23 GMThttps://devzone.nordicsemi.com/thread/432879?ContentTypeID=1Mon, 26 Jun 2023 08:49:23 GMT137ad170-7792-4731-bb38-c0d22fbe4515:22606adc-c6b6-4bb6-9633-8e956d491310Jerry Easley<p>I;m having problems building an application which includes a bootloader; I have another ticket about that.&nbsp; I removed both V2.3.0 and v2.4.0 and reinstalled V2.4.0; the build problem persisted. I think you have answered my questions; thank you so much!</p> <p></p> <p>Regards,</p> <p>Jerry</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/432859?ContentTypeID=1Mon, 26 Jun 2023 07:27:14 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ee826e95-7696-4732-8516-4b5674a1cddc&#216;yvind<p>Hey Jerry! Are you using the Toolchain Manager and the VS Code extension?</p> <p>When using the VS Code extension and you have nRF Connect SDK v2.3.0 installed on you computer, you can change environment through the Welcome Page.</p> <p><img style="max-height:240px;max-width:320px;" src="https://devzone.nordicsemi.com/resized-image/__size/640x480/__key/communityserver-discussions-components-files/4/pastedimage1687764392343v6.png" alt=" " /></p> <p></p> <p></p> [quote user=""]Also I think my v2.4.0 SDK is somehow damaged[/quote] <p>What is the issue you are seeing? Could you provide some more details please?&nbsp;</p> <p>Kind regards,<br />Øyvind</p><div style="clear:both;"></div>