> For the complete documentation index, see [llms.txt](https://manual.rotrics.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://manual.rotrics.com/faq-troubleshooting/troubleshooting/troubleshooting-cant-connect.md).

# DexArm couldn't connect to my computer

## 1) Make sure you are using the `USB A to C` cable to connect DexArm with your computer. 

The Dual USB-C cable won't work. If your computer doesn't have a USB-A port, go get a **USB Hub**.

![USB A-C cable for connecting DexArm with computer.](/files/-MCP_8lsS_3xVfh4ELdK)

## 2) Make sure DexArm is physically connected to your computer. 

### 💻**Windows Users**

A. Open **Device Manager** and you should see an **STMxxx COM port** which is for DexArm. 

<div align="left"><img src="/files/-MCQvPy6HDyshj3M9ghF" alt=""></div>

If it doesn't show as an STM port, please [**DOWNLOAD** ](https://www.rotrics.com/pages/download)and install the STM virtual serial driver.&#x20;

* Install W7 if your system is Windows 7.&#x20;
* Install W8 if your system is Windows 8 or 10.&#x20;

B. Open Rotrics Studio to connect DexArm.&#x20;

<div align="left"><img src="/files/-MCj6b3mqisFAF72a2R0" alt=""></div>

If couldn't find the port in Rotrics Studio, check the port 1 at the back of DexArm and see if there is a LED blinking or not. If you can see the blinking LED, pleas follow the [**instruction** ](https://manual.rotrics.com/troubleshooting/troubleshooting-3#3-failed-to-upgrade-rotrics-dexarms-firmware)to update DexArm's firmware with a third-party software.&#x20;

### 💻**Mac Users**

**A.** Go to **About This Mac > System Report > USB** and you should see an **STMxx** device.&#x20;

![](/files/-MCjEsVJEbakfkjQGPIY)

![](/files/-MCjExs6SgMxCCqk3rtc)

![](/files/-MCjFNopmIYrZjb9M4MO)

B. Open Rotrics Studio to connect DexArm.&#x20;

<div align="left"><img src="/files/-MCj6b3mqisFAF72a2R0" alt=""></div>

If couldn't find the port in Rotrics Studio, check the port 1 at the back of DexArm and see if there is a LED blinking or not. If you can see the blinking LED, pleas follow the [**instruction**](/faq-troubleshooting/troubleshooting/failed-to-upgrade-rotrics-dexarms-firmware.md) to update DexArm's firmware with a 3rd party software.&#x20;