https://devzone.nordicsemi.com/f/nordic-q-a/36326/nrf52840-q1aac0-secure-dfu-problemWe use nRF52840-PDK (PCA10056) with MCU revision Q1AAAA. Given example of secured DFU bootloader (s140) works good. Then we changed MCU on this board to the MCU with Q1AAC0 revision, and the same example of secure DFU do not work, as also do not worken-USTelligent Community 13Fri, 13 Jul 2018 14:17:01 GMThttps://devzone.nordicsemi.com/thread/140079?ContentTypeID=1Fri, 13 Jul 2018 14:17:01 GMT137ad170-7792-4731-bb38-c0d22fbe4515:f0aa7b96-6a0a-479c-8d65-98f109378243distapcher<p>Hi!</p> <p>Yes, all BLe examples from SDK 15 (SoftDevice 140) do not work. but from nRF work (but only when devboard is very close to the phone (about 5-10cm)). thank you about link - we will study it</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/139942?ContentTypeID=1Thu, 12 Jul 2018 16:12:37 GMT137ad170-7792-4731-bb38-c0d22fbe4515:1b40582d-ad31-4eb6-9293-ee004dbeeb39Hung Bui<p>Hi,&nbsp;</p> <p>&nbsp;</p> <p>Could you confirm that all the BLE applications didn&#39;t work when you switch the chip ?&nbsp;<br />Maybe the problem related to <a href="https://devzone.nordicsemi.com/b/blog/posts/difference-between-nrf52840-engineering-a-and-b-re">this</a>.</p><div style="clear:both;"></div>