I am flashing a device which enumerates with different product Ids during each phase of the flash process. When connected usbserial is correctly added based on my entry in /etc/modules. Once I flash the device, the device automatically re-enumerates but doesn't add usbserial again for the newly reported productId even though it is also in /etc/modules.

I am assuming it is because I didn't physically disconnect the usb device. If I do disconnect the device the initial image I flashed is lost and a I'm back a step one. Is there any way to get this to work without writing a kernel module?

usbserial doesn't allow for multiple product ids. so a custom kernel module is required