We 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 work other corresponding to s140 BLE examples. But applications from nRF Connect (such as BLE scanner) work fine. Surely, Softdevice version was updated in newly soldered chip. What can be the problem?
Could you confirm that all the BLE applications didn't work when you switch the chip ? Maybe the problem related to this.
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