Serial includes built-in support for the WCH (or WinChipHead) CH340 and CH341 bridge chips.
Due to the architecture of macOS, when a kernel driver binds to a device it blocks Serial's built-in support for that device, forcing Serial to use the kernel driver. Therefore, a problematic or outdated kernel driver can affect your experience using Serial. To determine which driver is being used to access your device, see How can I tell which driver is being used to access a device? .
There is a vendor driver available but we cannot recommend it as it is known to cause severe system crashes including kernel panics that can cause you to lose data. We strongly recommend removing this driver completely if present- see How to Remove a Kernel Driver .
Apple began shipping their own driver, "AppleUSBCHCOM", for some WCH devices with macOS 10.14 (Mojave). If you're running 10.14 or later, and you experience problems with the device, the only option available is to disable the Apple driver - see How to Disable a Kernel Driver .