ZTE MF831. Был успешно разлочен. 
Сменил usb composition на 905A (  905A -       DIAG+ADB+MBIM : ECM), но после перезагрузки видится только DIAG-интерфейс VID 05C6 PID 905A
Через него без вопросов хожу в EFS Explorer, QPST отлично видит телефон.  Но доступа к ADB Shell нету.
При загрузке появляются некоторые интерфейсы, но потом сами отваливаются. Это хорошо видно в dmesg, например.
[  461.610072] usb 1-2.1: new high-speed USB device number 11 using xhci_hcd
[  461.793073] usb 1-2.1: New USB device found, idVendor=19d2, idProduct=0016
[  461.793077] usb 1-2.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[  461.793078] usb 1-2.1: Product: ZTE Wireless Ethernet Adapter
[  461.793080] usb 1-2.1: Manufacturer: ZTE,Incorporated
[  461.824587] option 1-2.1:1.0: GSM modem (1-port) converter detected
[  461.824768] usb 1-2.1: GSM modem (1-port) converter now attached to ttyUSB1
[  471.416356] usb 1-2.1: USB disconnect, device number 11
[  471.416475] option1 ttyUSB1: usb_wwan_indat_callback: resubmit read urb failed. (-19)
[  471.416481] option1 ttyUSB1: usb_wwan_indat_callback: resubmit read urb failed. (-19)
[  471.416484] option1 ttyUSB1: usb_wwan_indat_callback: resubmit read urb failed. (-19)
[  471.416486] option1 ttyUSB1: usb_wwan_indat_callback: resubmit read urb failed. (-19)
[  471.416793] option1 ttyUSB1: GSM modem (1-port) converter now disconnected from ttyUSB1
[  471.416812] option 1-2.1:1.0: device disconnected
[  472.035483] usb 1-2.1: new high-speed USB device number 12 using xhci_hcd
[  472.252976] usb 1-2.1: New USB device found, idVendor=05c6, idProduct=905a
[  472.252980] usb 1-2.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[  472.252983] usb 1-2.1: Product: ZTE Wireless Ethernet Adapter
[  472.252985] usb 1-2.1: Manufacturer: ZTE,Incorporated
[  472.354611] cdc_ether 1-2.1:2.0 usb0: register 'cdc_ether' at usb-0000:03:00.0-2.1, CDC Ethernet Device, 36:4b:50:b7:ef:da
[  472.354700] usbcore: registered new interface driver cdc_ether
[  472.401028] cdc_ether 1-2.1:2.0 usb0: kevent 11 may have been dropped
[  472.401316] cdc_ether 1-2.1:2.0 usb0: kevent 12 may have been dropped
[  477.364334] usb 1-2.1: USB disconnect, device number 12
[  477.364472] cdc_ether 1-2.1:2.0 usb0: unregister 'cdc_ether' usb-0000:03:00.0-2.1, CDC Ethernet Device
[  490.397156] usb 1-2.1: new high-speed USB device number 13 using xhci_hcd
[  490.547593] usb 1-2.1: New USB device found, idVendor=19d2, idProduct=0076
[  490.547596] usb 1-2.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[  490.547597] usb 1-2.1: Product: QHSUSB__BULK
[  490.547598] usb 1-2.1: Manufacturer: Qualcomm CDMA Technologies MSM
[  490.551498] option 1-2.1:1.0: GSM modem (1-port) converter detected
[  490.551788] usb 1-2.1: GSM modem (1-port) converter now attached to ttyUSB2
Реально ли получить снова доступ к ADB?