https://devzone.nordicsemi.com/f/nordic-q-a/4123/about-uuidint lbs Hi,everyone,we change the uuid to #define LBS_UUID_SERVICE 0x2101 #define LBS_UUID_LED_CHAR 0x3A01 #define LBS_UUID_BUTTON_CHAR 0x3A02 in nrf51-ble-app-lbs-master project In the master control panel we get them，the right number； buten-USTelligent Community 13Fri, 17 Oct 2014 02:25:35 GMThttps://devzone.nordicsemi.com/thread/14750?ContentTypeID=1Fri, 17 Oct 2014 02:25:35 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e002579c-7162-4f60-a736-3a9a6b493818lkhsnow<p>you are right, thank you！ Right UUIDs come up after I reboot my phone， we&#39;re modifing the app to erase the bond GATT database.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/14749?ContentTypeID=1Thu, 16 Oct 2014 14:45:49 GMT137ad170-7792-4731-bb38-c0d22fbe4515:6ddea504-04f3-42fd-8347-bb6ca617a116Ulrich Myhre<p>The Android app might be caching the remote GATT database if the two have bonded. It is not allowed to change the database for a bonded device without using the &quot;Service Changed&quot; characteristic, so in your case you will have to erase the bond from the Android side.</p><div style="clear:both;"></div>