Which release and IDE are you using? Did you make any other change in the example?
By any chance, could you please reply in English?
I use MCUXpresso IDE v10.1.1_606 and import the example(thread_low_power_end_device).
I changed the macro definition THREAD_USE_SHELL in the file config.h to 1.
Then I type the command ‘thr join’ in the shell, but it prints out ‘join failed’.
I uploaded two sniffing messages, one was successfully added and the other was added by the example.
Based on shell log ( Thread version - 126.96.36.199), seems to be the same problem with the one from this topic : Thread low power end device examples can't thr join?
A new release including the fix for low power devices will be available at the end of July.