The DFU upgrade of NRF52840 failed. Procedure

[liuyanfeng]

Why is it so easy to disconnect when upgrading to a few points? The upgrade may be complete

I used SDK 17.0.2's ble_APP_ButtonLess_dFU routine

 

Do you know? Thank you for guiding me!

[Amanda Hsieh]

Hi, 

Do you update with SD (+ BL) + APP in one package?

See DFU package combinations:

The SD (+ BL) + APP update is done with two consecutive connections unless a custom bootloader is used. First the SD (+ BL) is updated, then the bootloader will disconnect and the (new) BL will start advertising. Then the second connection to the bootloader will update the APP.

-Amanda H.