# 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.](https://2132465959-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LtPFIBncU5l4J8tl5Yh%2F-MCPZl9jl1yNOtifcL5y%2F-MCP_8lsS_3xVfh4ELdK%2Fimage.png?alt=media\&token=62e72056-af79-4ab0-8d68-55528321869d)

## 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="https://2132465959-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LtPFIBncU5l4J8tl5Yh%2F-MCP_jsClt_hXeLDxhL6%2F-MCQvPy6HDyshj3M9ghF%2Fimage.png?alt=media&#x26;token=32a3788b-c934-40ee-a487-0ef03d42abb0" 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="https://2132465959-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LtPFIBncU5l4J8tl5Yh%2F-MCj3H8oNYGNH3dm06Do%2F-MCj6b3mqisFAF72a2R0%2Fimage.png?alt=media&#x26;token=561ed2c7-aed7-4f55-bdcd-758945d4fad2" 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;

![](https://2132465959-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LtPFIBncU5l4J8tl5Yh%2F-MCj3H8oNYGNH3dm06Do%2F-MCjEsVJEbakfkjQGPIY%2FLark20200721-104127.png?alt=media\&token=40966565-f8da-4331-8ad0-6dea44f11949)

![](https://2132465959-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LtPFIBncU5l4J8tl5Yh%2F-MCj3H8oNYGNH3dm06Do%2F-MCjExs6SgMxCCqk3rtc%2FLark20200721-104038.png?alt=media\&token=bc4bda55-48ab-49b6-acf4-a0fa41161885)

![](https://2132465959-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LtPFIBncU5l4J8tl5Yh%2F-MCj3H8oNYGNH3dm06Do%2F-MCjFNopmIYrZjb9M4MO%2FUSB%20List.png?alt=media\&token=c2a5a036-0324-4053-927e-934a8282c067)

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

<div align="left"><img src="https://2132465959-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LtPFIBncU5l4J8tl5Yh%2F-MCj3H8oNYGNH3dm06Do%2F-MCj6b3mqisFAF72a2R0%2Fimage.png?alt=media&#x26;token=561ed2c7-aed7-4f55-bdcd-758945d4fad2" 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/faq-troubleshooting/troubleshooting/failed-to-upgrade-rotrics-dexarms-firmware) to update DexArm's firmware with a 3rd party software.&#x20;