https://devzone.nordicsemi.com/f/nordic-q-a/3101/sd_ble_enable-returns-error-code-5I&#39;m trying the ble_app_hrs example on a custom nRF51822 board with s110 6.0.0 softdevice. Debugging in Keil, the firmware runs fine up to ble_stack_init(). Within ble_stack_init() the call to sd_ble_enable(&amp;ble_enable_params); returns error code 5en-USTelligent Community 13Mon, 22 Sep 2014 16:00:13 GMThttps://devzone.nordicsemi.com/thread/11518?ContentTypeID=1Mon, 22 Sep 2014 16:00:13 GMT137ad170-7792-4731-bb38-c0d22fbe4515:65221079-e842-4dfd-b7a2-5c9074f87eedJules<p>Hello !</p> <p>I am having the same problem but using SDK v6.0 and SoftDevice 7.0.0-3. Is it really safe to comment out the block ? Will the ble stack be enabled ? I have read somewhere that the SOFTDEVICE_HANDLER_INIT macro would enable it but I would like confirmation.</p> <p>Thanks !</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/11517?ContentTypeID=1Sun, 13 Jul 2014 23:23:46 GMT137ad170-7792-4731-bb38-c0d22fbe4515:fc943199-decc-450d-8e63-d79437af61c6George<p>Thanks Ulrich ..now that explains a lot of strange behavior I was finding!</p> <p>I had completely assumed that SDK 6.0.0 refers to S110 6.0.0 ...thought the version numbers simply followed each other.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/11516?ContentTypeID=1Sun, 13 Jul 2014 22:09:20 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c7c18658-2c28-46c2-9bf5-07c38037bc48Ulrich Myhre<p>The SDK v6.0 is for S110 version 7.0.0. If you are using the S110 6.0.0 you have to use SDK version 5.2. The API call sd_ble_enable() does not exist in 6.0.0.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/11515?ContentTypeID=1Sat, 12 Jul 2014 16:17:56 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ecbbf9ce-4aff-4d83-8cb8-2cdd063c334bGeorge<p>it seems I have found a solution ...I commented out the complete code block shown in my post above and now it works as expected.</p> <p>Why is this so ?</p><div style="clear:both;"></div>