https://devzone.nordicsemi.com/f/nordic-q-a/26701/nrf-51822-is-not-discoverableIn NRF 51822 custom board I uploaded ble_app_uart code. Program uploaded successfully. But not able to discover from Phone and Tablet, where in another board it works properly. What is the problem here?Kindly help me on this...en-USTelligent Community 13Wed, 08 Nov 2017 07:59:18 GMThttps://devzone.nordicsemi.com/thread/105003?ContentTypeID=1Wed, 08 Nov 2017 07:59:18 GMT137ad170-7792-4731-bb38-c0d22fbe4515:71a7c3b3-f35b-400e-9537-fd4013512877Manikandan<p>Thanks for reply. SDk-9.0 Softdevice-s110 No 32Khz Crystal. only 16Mhz Crystal.So I will change the code for 32Khz RC osc and catch you. But I have one doubt, I have 2 custom board with same design. One board works fine another board only having this problem.Why?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/105002?ContentTypeID=1Wed, 08 Nov 2017 07:39:41 GMT137ad170-7792-4731-bb38-c0d22fbe4515:fcd3c555-bd89-4fae-a251-ef3e3d7deeedJay Tyzzer<p>Hi Manikandan,</p> <p>What version of the SDK are you using and what version of the Softdevice?</p> <p>Did you include the 32Khz Crystal option on your board? If not then you will need to configure the firmware to use the 32Khz RC osc. All of the BTLE examples in the SDKs use the 32Khz Crystal Osc. If this is the case then you can do a search here on the dev zone for the proper way to change the code to use the 32Khz RC osc.</p> <p>Jay</p><div style="clear:both;"></div>