AMD Confirms AGESA 1.2.0.2 Update Will Address Ryzen USB Connectivity Issues AMD reckons it knows why some Ryzen owners are experiencing USB flakiness with motherboards based on a 500-series chipset. And with that knowledge, it plans to roll out a fix. This will come by way of a BIOS update, the timing of which will partially depend on the make and model of your specific motherboard. This primarily has to do with users reporting dropped connections from external peripherals hooked up to a USB 2.0 port. For whatever reason, 500-series motherboards have been having issues in such scenarios, when PCI Express 4.0 is enabled in the BIOS. There was always the option of disabling PCIe 4.0—AMD also offered up a few other potential fixes last week—but that takes away from one of the platform's main features.