Watchdog is useless

[Fabien Comte]

Hello,

I have a secure bootloader and an application on nRF52840 with SD 15.2.

I try to add watchdog support in application based on watchdog exemple but if i remove feed, it not resets… 

Do someone have an idea please ?

Thank you.

[Fabien Comte]

I found, my hex file was not updated on each build (looks like if it was locked) and my tries were useless (same application each time). It works now. Thank you for your help.