Silicon Labs CP210x USB to UART Bridge driver
Latest driver
What is CP210x?
CP210x is a family of USB to UART bridge chips from Silicon Labs: CP2102 and CP2102N, CP2104, CP2105 (two serial ports) and CP2108 (four ports). They are used on ESP32 development boards, Zigbee and Z-Wave USB sticks, industrial RS-232/RS-485 adapters and many embedded devices. Windows lists the chip as USB\VID_10C4&PID_EA60; CP2105 uses PID_EA70 and CP2108 PID_EA71.
Which driver version?
Silicon Labs publishes a “universal” driver for Windows 10 and 11 that supports x86, x64 and ARM64. It is also distributed through Windows Update, so many PCs install it on first connection. Use the latest driver on this page if the adapter appears as CP2102 USB to UART Bridge Controller under Other devices, or if the COM port does not show up.
After installation
- Device Manager shows Silicon Labs CP210x USB to UART Bridge (COMx) under Ports (COM & LPT).
- Use that COM number in your flashing tool (for example esptool or the Arduino IDE) or terminal program.
- For boards that flash firmware automatically, make sure no other program keeps the port open.
Common problems
- Board not detected — try another USB cable (many are charge-only) and a different port.
- Upload fails at “Connecting…” on ESP32 — this is usually not a driver issue: hold the BOOT button while the upload starts.
- Customized CP210x devices may report a different product ID set by the manufacturer. Check the hardware ID and search for it.
Linux supports these chips with the in-kernel cp210x module.
All drivers
| Driver | Version | Date | Windows | Bits |
|---|---|---|---|---|
| Silicon Labs CP210x USB to UART Bridge Driver | 11.5.0.417 | Dec 10, 2025 | Windows 10, 11 | 32-bit & 64-bit, ARM64 |
| Silicon Labs CP210x USB to UART Bridge Driver | 11.2.0.167 | Oct 4, 2022 | Windows 10, 11 | 32-bit & 64-bit |
| Wacom Cintiq/Intuos 3/4/5/Pen/Pro/PL Driver | 6.3.46-1 | Mar 29, 2022 | Windows 7–11 | 32-bit & 64-bit |
| Wacom Cintiq/Intuos 3/4/5/Pen/Pro/PL Driver v.6.3.44-1 | 6.3.44-1 | Aug 4, 2021 | Windows 7–10 | 32-bit & 64-bit |
| Silicon Labs CP210x Universal Windows Driver | 10.1.10.103, 6.7.6.2130 | Jan 8, 2021 | Windows 7–10 | 32-bit & 64-bit |
| Wacom Cintiq/Intuos 3/4/5/Pen/Pro/PL Driver | 6.3.39-1 | Apr 27, 2020 | Windows 7–10 | 32-bit & 64-bit |
| Wacom Cintiq/Intuos 3/4/5/Pen/Pro/PL Driver | 6.3.41-1, 6.3.40-3, 3.8.10.30 | Mar 30, 2020 | Windows 7–10 | 32-bit & 64-bit |
| Wacom Tablet Drivers | 6.3.33-3, 3.8.10.20 | Jan 10, 2019 | Windows 7–10 | 32-bit & 64-bit |
| Wacom Tablet Drivers | 6.3.30-6\3.8.10.9, 6.3.18-5\3.6.1.6 | May 23, 2018 | Windows XP–10 | 32-bit & 64-bit |
| Silicon Labs CP210x device Driver | 6.7.4.261 | Sep 19, 2016 | Windows 7–10 | 32-bit & 64-bit |
| Silicon Labs CP210x USB to UART Bridge Drivers | 6.7.3.350 | Mar 28, 2016 | Windows XP–10 | 32-bit & 64-bit |
| Silicon Labs ELM327 USB Drivers for CP210x | 6.7.0.0 | Mar 19, 2014 | Windows XP–8.1 | 32-bit & 64-bit |
| HiTi CS-3xx Series Card Printer Drivers | 3.0.0.21 | Mar 4, 2014 | Windows XP–7 | 32-bit & 64-bit |
| HiTi CS-31x Series Card Printer Drivers | 2.3.0.14b | Dec 9, 2009 | Windows XP–7 | 32-bit & 64-bit |
Hardware IDs
Compare these IDs with Device Manager → Properties → Details → Hardware Ids of your device (how to find them).
| Hardware ID | Device | Drivers |
|---|---|---|
| USB\VID_10C4&PID_EA60 | CP210x UART Bridge / myAVR mySmartUSB light | 14 |
| USB\VID_10C4&PID_EA70 | CP210x UART Bridge | 12 |
| USB\VID_10C4&PID_EA71 | Quad CP210x USB to UART Bridge: Interface 0 | 12 |