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Use U31 only within a sanctioned training environment or by requesting an official demo. If you are a student, consider open-source NMS like LibreNMS or NetXMS for learning generic concepts, and approach ZTE University for sanctioned access.

/* Pseudocode: send vendor-specific control transfer to switch U31 from storage to modem */ val requestType = UsbConstants.USB_DIR_OUT or UsbConstants.USB_TYPE_VENDOR val request = 0x55 val value = 0x0001 val index = 0 deviceConnection.controlTransfer(requestType, request, value, index, null, 0, 2000) zte netnumen u31 download work

On Linux: