Unable to exit the diagnostic mode!!

[kitt97]

Hi to all,

I have a ZTE MF833T modem of which I wanted in every way to change the ip address.

So I downloaded DC-Unlocker and I enabled the diagnostic mode.

The modem has rebooted and two new devices have appeared: USB-LOG and USB-AT.

I tried to install the ZTE serial driver on the second device and actually managed to send AT commands to the modem.

But now I can not go back to normal mode: the Disable Diagnostic Mode button of DC-Unlocker reports AT command error.

I have already tried to send commands of type AT+ZCDRUN=5 but they are all rejected by the modem.

Please help me! Thanks

[Valdemaras]

No, sorry, we do not have solutions for it. We do not support this device model.

[kitt97]

Yes, I understand that it isn't supported but in any case the software has managed to enable the diagnostic mode so not much supported I wouldn't say...
Pretend it's a ZTE MF831
No one has an idea?

[Valdemaras]

It might have matched supported versions therefore enabling worked, but it may run different disabling command that we do not know sadly.

[kitt97]

The modem is initially configured as two devices: Bootloader and Serial. After 10 seconds they become USB-LOG and USB-AT. The latter responds to many AT commands (AT, ATE1, AT+ZRSSI, AT+ZSEC? ...) while for others it returns invalid command (ATZ, AT+ZOPRT = 5, AT+ZCDRUN = F).
Maybe I have to unlock the other commands somehow?
Probably some usb_modeswitch cmd in linux?