> ## Documentation Index
> Fetch the complete documentation index at: https://dragonwingdocs.qualcomm.com/llms.txt
> Use this file to discover all available pages before exploring further.
# Switch to EDL mode using UART
## Introduction
Describes an alternative procedure to switch devices into EDL mode
using UART. This procedure is only applicable if the device has a preloaded build.
At a high level, the workflow includes the following:
* Set up the host system with the required tools (UART console access)
* Establish a UART connection to the device
* Trigger the device to enter EDL mode using UART commands
## Install required packages
Minicom is a lightweight, terminal-based serial communication program used on Linux systems
to interact with devices over a UART (serial) connection. It allows you to access the device’s
console, view boot logs, and send commands directly to the system at a low level.
Install Minicom on the host system:
```bash theme={null}
sudo apt install minicom
```
## Connect to a UART shell
* To set up the debug UART connection and view the diagnostic messages, connect the micro-USB cable from the micro-USB port on the device to the Linux host.
* Check if the USB port is detected:
```bash theme={null}
ls /dev/ttyUSB*
```
```text Sample output theme={null}
/dev/ttyUSB0
```
* Open Minicom:
```bash theme={null}
sudo minicom -s
```
* Use the Down arrow key to select the **Serial port setup** option. Use the Up and Down arrow keys to navigate through the menu.
* Set up the serial device configuration:
* Select **A** on your keyboard to set up the serial device name such as `/dev/ttyUSB0`.
* Select **Enter** to save the changes.
* Select **E** on your keyboard to set the baud rate and 8N1 configuration:
* Select the **E** key again if the baud rate isn’t set to **115200**.
* Select the **Q** key if the configuration isn’t set to **8N1**.
* Select **Enter** to save the changes.
* Select **F** on your keyboard to set the **Hardware Flow Control** to `No`.
* Select **Enter** to save the changes.
* Select the **Save setup as dfl** option and then select **Enter**.
* Select **EXIT** to open the UART console and then select **Enter**.
* Sign in to the UART console:
* Login: `root`
* Password: `oelinux123`
If the sign in console doesn't display as expected, verify the USB connection. If the issue persists, disconnect and then reconnect the micro-USB.
## Switch device to EDL mode
* In the UART shell, move the device into EDL mode:
```bash theme={null}
reboot edl
```
* Verify if the device is in EDL mode:
```bash theme={null}
lsusb
```
```text Sample output theme={null}
Bus 002 Device 014: ID 05c6:9008 Qualcomm, Inc. Gobi Wireless Modem (QDL mode)
```