https://devzone.nordicsemi.com/f/nordic-q-a/8611/is-beacon-rev-1-1-0-compatible-with-softdevice-s110-v8-0Hi, I have nrf51822 bluetooth smart kit Rev 1.1.0 . Is this beacon compatible with Softdevice110 V8.0? I want to know this because I have read that &quot;The CPU will by default be available for the application during RF activity&quot; at this version of softdeviceen-USTelligent Community 13Fri, 07 Aug 2015 22:24:50 GMThttps://devzone.nordicsemi.com/thread/31511?ContentTypeID=1Fri, 07 Aug 2015 22:24:50 GMT137ad170-7792-4731-bb38-c0d22fbe4515:370d8030-e10b-4ae1-942e-a0dce792b895Petter Myhre<p>It depends on what chip revision of the nRF51 you have. You need to compare the device markings of your chip with Table 2 in the <a href="https://www.nordicsemi.com/eng/Products/Bluetooth-Smart-Bluetooth-low-energy/nRF51822#Downloads">nRF51 Series Compatibility Matrix</a> to figure out what revision you have. Then you check Table 4 to see what SoftDevices and SDKs that are compatible with your chip.</p> <p>If you use SoftDevice S110 8.0.0 with a revision 2 chip you should enable mutual exclusion between the radio and the application. Please see the Changes section in the S110 8.0.0 release notes for more information.</p> <pre><code>uint32_t opt_id = BLE_COMMON_OPT_RADIO_CPU_MUTEX; ble_opt_t cpu_blocking_enabled; cpu_blocking_enabled.common_opt.radio_cpu_mutex.enable = 1; ble_stack_init(); err_code = sd_ble_opt_set(opt_id, &amp;cpu_blocking_enabled); </code></pre> <p>I can&#39;t check what revision is on the 1.1.0 now, but I can on Monday, please add a comment if you can&#39;t figure it out.</p><div style="clear:both;"></div>