USB serial number will mutation at USB RAW device running

[zpc-anhuibl]

Hello, I had some questions regarding communication with a USB Raw Device.

The PC is WIN7
The USB device connected with PC and then the USB device is shown in NI MAX as USB::0x0525::0xA4A6::NI-VISA-40004::RAW
Then USB device could read or write data
Some time later,The device can't read or write data, then the device USB is shown in NI MAX as USB::0x0525::0xA4A6::NI-VISA-30004::RAW,the serial number have changed.

How to make the serial number remain the same?

Any help will be appreciated.

[mkossmann]

The device ID is owned by the "Linux-USB Serial Gadget". As far as I know, such linux based devices have the option to change their USB serialnumber in their device tree,  So I fear, that you have to look into the USB device ( or its documentation) to get an idea why it is changing its serialnumber.