https://devzone.nordicsemi.com/f/nordic-q-a/50685/nrf51822-in-eysgjnawy-wxHello All My English is not good, so Sorry I have a question like this I have self BLE unit - EYSGJNAWY-WX from TAIYO YUDEN firm That has nrf51822 CPU and 32.000 crystal ( i have not KIT like examle nrf51 DK etc) but his srvices they do not suit meen-USTelligent Community 13Wed, 11 Sep 2019 08:17:00 GMThttps://devzone.nordicsemi.com/thread/209094?ContentTypeID=1Wed, 11 Sep 2019 08:17:00 GMT137ad170-7792-4731-bb38-c0d22fbe4515:9eeddc75-63c4-48f3-a2d2-a483de1b04e6Einar Thorsrud<p>Hi,</p> <p>A typical reason for&nbsp;ble_stack_init() is that&nbsp;sd_softdevice_enable() is waiting for the low frequency (32.768 kHz) clock to start. The SDK examples are configured to use the optional 32 kHz crystal, and if this is not part of the module this initialization will fail. The fix is to modify the SoftDevice configuration to start the internal 32.768 kHz RC oscillator (LFRC) instead. The way to do this depends a bit on the SDK version,but assuming you are using SDK 12.3 or similar, you should do as <a href="https://devzone.nordicsemi.com/f/nordic-q-a/28445/can-t-run-bootloader_secure-on-customer-board/112363#112363">described here</a>.</p><div style="clear:both;"></div>