Device does not start after bootloader/softdevice DFU

[shtsht]

[symptom]

I want to update my application/bootloader/softdevice by DFU. Steps are shown below.

1. bootloder/softdevice update.
2. if 1 step is done, application update comes next.

I wrote some code for iOS/Android apps based on IOS-Pods-DFU-Library/Android-DFU-Library. As a result, bootloader/sofdevice update is correctly done. However, after bootloader/sofdevice is updated, device don't start automatically for next application update(step 2).

[workaround]

Pushing the power button boots device and application update correctly follows. However, this is not good for user experience. Therefore this could not be our option.

[condition]

• nrf51
• S110 SoftDevice v8.0
• single bank

Could you please give me any clue? Thanks in advance

[Hung Bui]

@shtsht: Please correct me if I am wrong. You meant you can update the bootloader and or softdevice , but the device doesn't start in bootloader mode after you update and it requires you to turn the device off an on with a button pressed ?

Are you sure you managed to update the bootloader successfully ? Have you verified by for example change the device name in the advertising packet? Have you tested with updating the application ? When you update the application, would the new application start automatically ?

Have you made sure the APP_VALID bit in the bootloader is not set by accident ? When there is no application , this bit should be set as INVALID_APP.

You may consider to modify the bootloader so you can debug it after you update the bootloader. You can have a look at question F in this FAQ.