I tested Silicon Power USB3.0 8GB/32GB drive with BIOS P1.80, the USB3.0 devices can be recognized by USB3.0 ports.
Please refer to below suggestions to try.
1. Load BIOS default settings.
2. Before booting system, please plug USB3.0 device to U3 port and press "F11" to boot menu to check if the devices can be recognized.
3. Try the USB3.0 device to another system to check if the device is fine.
4. If possible, please try another USB3.0 drive to double check it.
Have a nice day