https://devzone.nordicsemi.com/f/nordic-q-a/60491/custom-uuid-troublesIn an attempt to add a custom UUID to your current project I change NRF_SDH_BLE_VS_UUID_COUNT from 0 to 1. Then loaded the code onto our PCA100040 53822 devkit. At runtime ble_stack_init() calls nrf_sdh_ble_enable() returns with error code 4 (NRF_ERROR_NO_MEMen-USTelligent Community 13Tue, 21 Apr 2020 17:55:20 GMThttps://devzone.nordicsemi.com/thread/245905?ContentTypeID=1Tue, 21 Apr 2020 17:55:20 GMT137ad170-7792-4731-bb38-c0d22fbe4515:fd9eebc3-47b9-4d94-a55a-82f747eebdb5Vidar Berg<p>Thanks for the update. I forgot to refresh the page before posting my answer:)</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/245904?ContentTypeID=1Tue, 21 Apr 2020 17:53:37 GMT137ad170-7792-4731-bb38-c0d22fbe4515:f86561b7-bfb3-4125-bf85-3ceb456a9217Vidar Berg<p>Hello,</p> <p>The current app RAM base address is probably set too low&nbsp;so the Softdevice can&#39;t fit the new UUID buffer. So basically you need to increase the app RAM start address to free RAM to the Softdevice. If you have debug logging enabled you should get a warning message stating what the new minimum RAM start address requirement is.&nbsp; If not you can just try to increase it with a few bytes. 16 bytes is probably enough considering the&nbsp;size of the vendor UUID</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/245903?ContentTypeID=1Tue, 21 Apr 2020 17:47:04 GMT137ad170-7792-4731-bb38-c0d22fbe4515:7bbd147b-d814-4491-9a01-209d12ac2751mac<p>I fixed the issue by setting the lower regions of RAM higher. I feel foolish <span class="emoticon" data-url="https://devzone.nordicsemi.com/cfs-file/__key/system/emoji/1f642.svg" title="Slight smile">&#x1f642;</span></p><div style="clear:both;"></div>