EM919x/EM7690 - AT Command Reference - +CTZU declared as not supported but works on EM91

In the AT Command Reference document, the CTZU is declared as not supported but on my EM91, the command is accepted and seems to activate the NITZ feature: The Hour on CLK is equal to the local time.

Could you please clarify the support of this feature on these series please ?


if AT command user guide says it is not supported, there will not be any verification and validation on this command.