nrf5340 how to forcefully enter into DFU mode if a buggy APP is loaded via DFU ?

Question

How can we forcefully enter into DFU mode in NRF5340 if for example the newly loaded application due to a bug is unable to advertise BLE? In another words, if I press reset button, I want the device to be in DFU mode for at least 10 seconds so that I can recover the device in case if the application crashes. 
 At present the DFU bootloader is a standalone bootloader with BLE capability or is jt just a switcher which jumps to the application downloaded new image partition?

Hung Bui · Accepted Answer

Hi Vinod, I understand your concern. Unfortunately that's the situation we have now. 
 You may consider setting a special mode in your application that does exactly what you want with the DFU failsafe mode. It will boot up and do nothing but advertise and wait for DFU connection. After 15 seconds it would start doing the normal routine to read eeprom and other normal function. 
 This way you can do some intensive test on the application to make sure it will manage to do the DFU basic task and avoid accessing any other function/peripheral. I agree that this is still not as robust as having a separate application (bootloader) , but other than that and the serial recovery mode, I don't find any better solution.

nrf5340 how to forcefully enter into DFU mode if a buggy APP is loaded via DFU ?

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