https://devzone.nordicsemi.com/f/nordic-q-a/120669/power-profiler-ppk2-stuck-in-bootloaderPPK2 is stuck in bootloader after trying to flash the latest firmware on Power Profiler 4.2.1 (Windows 10). The error is &quot;serialport could not be opened &quot;. The same issue is reported in Programmer. The prompt comes up to flash the firmware but hangsen-USTelligent Community 13Mon, 14 Apr 2025 11:10:10 GMThttps://devzone.nordicsemi.com/thread/531676?ContentTypeID=1Mon, 14 Apr 2025 11:10:10 GMT137ad170-7792-4731-bb38-c0d22fbe4515:2ef1c046-6c5a-47a2-9e11-d6c4cd1a4472runsiv<p>Thanks for the update. I was going to ask if you could try with an older fw which you can find <a href="https://github.com/NordicSemiconductor/pc-nrfconnect-ppk/tree/v4.1.3/firmware">here<br />H</a>owever if the issue is only on windows I would start by upgrading nrfutil and nrfutil device&nbsp;</p> <p>nrfutil self-upgrade</p> <p>nrfutil install device --force</p> <p>Regards</p> <p>Runar</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/531673?ContentTypeID=1Mon, 14 Apr 2025 11:00:45 GMT137ad170-7792-4731-bb38-c0d22fbe4515:f17de640-7524-43d7-abc6-a04fbfccf67adomw<p>Update: rebooted linux and all is well. I had tried rebooting windows with no luck so not sure what is going on there</p><div style="clear:both;"></div>