secret code for DZ09 CPU: MTK6260A 533MHz to get into service mode

HELLO
I have a new smartwatch but when i put my sim it doesn't work with my cell phone company ,
but with two other it works ,
anyway my question is :
what is the secret code for the service mode for the smartwatch DZ09 so i could enable the usage of the frequency 850 MHz .
thank you and have a nice day

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secret code for DZ09 CPU: MTK6260A 533MHz to get into service mode