https://devzone.nordicsemi.com/f/nordic-q-a/55329/thingy-91-deadHi, I received a Thingy91 from a colleague who orderd it shortly after hitting the virtual stores but didn&#39;t do a lot with it. I got it on my table and started to work on it, connecting power but not a single sign of life. No led activity anywhere.en-USTelligent Community 13Mon, 09 Dec 2019 13:10:46 GMThttps://devzone.nordicsemi.com/thread/224447?ContentTypeID=1Mon, 09 Dec 2019 13:10:46 GMT137ad170-7792-4731-bb38-c0d22fbe4515:6a4abc21-ef88-4086-8d39-86f11929dd98&#216;yvind<p>Hello,&nbsp;</p> [quote user=""]I got it on my table and started to work on it, connecting power but not a single sign of life. No led activity anywhere.[/quote] <p>I&#39;m so sorry to hear that. From the description you give, it sounds like the device is in &quot;<span>application serial recovery mode&quot;. To enter this mode, the main button must be held while powering on thingy:91. More <a href="https://devzone.nordicsemi.com/nordic/cellular-iot-guides/b/getting-started-cellular/posts/thingy91_2d00_fw_2d00_update_2d00_mcuboot">information here</a>.&nbsp;&nbsp;This link&nbsp;also provides more information on how to update the Thingy:91.&nbsp;<br /><br />Let me know how that works.<br /><br />Kind regards,<br />Øyvind</span></p><div style="clear:both;"></div>