If you can provide:
: Sites like DriverHub or DriverIdentifier host community-uploaded drivers for Pegatron boards. Common Specifications pegatron n14939 driver 91
If it’s a with 91 in version, it might be Realtek PCIe GbE driver 10.68.91.xxx . If you can provide: : Sites like DriverHub
If after installation you still see ("This device cannot start. (Code 91)"), here is the troubleshooting sequence. here is the troubleshooting sequence.