https://devzone.nordicsemi.com/f/nordic-q-a/122831/keep-breaking-nrf5340-dk-boardsDear forum, We are using the nrf5340-DK development boards as an intermediate link to flash our own boards containing the nrf5340 chip. This is possible since there is an integrated segger debugger on the boards. However there is something sensitive inen-USTelligent Community 13Wed, 09 Jul 2025 11:39:48 GMThttps://devzone.nordicsemi.com/thread/541928?ContentTypeID=1Wed, 09 Jul 2025 11:39:48 GMT137ad170-7792-4731-bb38-c0d22fbe4515:81d874a3-8b93-4fbb-897f-0b2a5ff5df4cJonasForssell<p>I have not done this. Thanks for the tip</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/541918?ContentTypeID=1Wed, 09 Jul 2025 10:51:08 GMT137ad170-7792-4731-bb38-c0d22fbe4515:0348fed5-18ee-4717-bd16-3d021c179bf8PaKa<p>and make sure to not hot swap the external target, power should be turned of on the nRF5 series DK when you plug in the external board and power the nRF5 DK up before powering up the external. Reverse for turning it of.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/541896?ContentTypeID=1Wed, 09 Jul 2025 08:52:54 GMT137ad170-7792-4731-bb38-c0d22fbe4515:b8a56e04-227c-48de-93b4-967d46abdd89JonasForssell<p>Thanks!</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/541891?ContentTypeID=1Wed, 09 Jul 2025 08:41:32 GMT137ad170-7792-4731-bb38-c0d22fbe4515:2600b855-e184-455f-87be-c2029c5d25b6Turbo J<p>Check PE. Floating ground would put the USB level floating at half mains. Not enough current to cause harm to&nbsp;<em>humans</em>, but electronics may be more sensitive.</p> <p>You may also want to invest into ESD prevention equipment (wristband/strap etc).</p><div style="clear:both;"></div>