https://devzone.nordicsemi.com/f/nordic-q-a/87415/keil-5-code-load-problemHi, I have reinstalled my Windows OS and I have just installed Keil 5. On my old OS I loaded softdevice with CLI with commands: nrfjprog.exe --recover nrfjprog.exe --program s130_nrf51_201_SD.hex Then I have loaded code with Keil interface withen-USTelligent Community 13Fri, 29 Apr 2022 08:11:29 GMThttps://devzone.nordicsemi.com/thread/365529?ContentTypeID=1Fri, 29 Apr 2022 08:11:29 GMT137ad170-7792-4731-bb38-c0d22fbe4515:07dfa218-7b8c-4618-ac3c-fd74fd025188dejans<p>Hi,<br /><br />There are several potential reasons for this to happen.&nbsp;<br />The issue has been previously discussed. Please take a look at these discussions -&nbsp;<a href="https://devzone.nordicsemi.com/f/nordic-q-a/296/error---flash-download-failed---cortex-m0">first</a>,&nbsp;<a href="https://devzone.nordicsemi.com/f/nordic-q-a/9/why-do-i-get-error-flash-download-failed-cortex-m0-when-downloading-a-project-from-keil">second</a>&nbsp;and&nbsp;<a href="https://devzone.nordicsemi.com/f/nordic-q-a/69585/nrf51-dk-using-keil-error-flash-download-failed---cortex-m0">third</a>.<br /><br />Best regards,<br />Dejan</p><div style="clear:both;"></div>