OTA Failed！Failed to Mcumgr DFU: Invalid header magic number

[spring.liu]

why can cause this  problem！ I'm not familiar with NCS OTA

[Einar Thorsrud]

We do, that is the example I referred to under <SDK>/zephyr/samples/subsys/mgmt/mcumgr/smp_svr/. See documentation here: SMP Server Sample. This sample works out of the box. You use it in the exact same way as you do with 2.0.0, just remember to use the configuration overlay file for Bluetooth when you build it.

[spring.liu]

smp_svr  I run and it is ok  ,I tried to transplant  main.c and bluetooth.c .I hope it will work