How to Fix the “Oops, couldn’t connect to device” error for Ledger Nano S

If you have ever faced the dreaded “Oops, couldn’t connect to device” error, you will be well aware how frustrating it can be to solve. The error appears to strike at random and has multiple possible causes, which can make it a challenge to resolve. 

For the great majority of users, this error is first noticed when trying to install a new app through the Ledger Live manager. After connecting to Ledger Live and entering the Manager tab, the error would be displayed during the app installation process, leading to a failure to install new apps. This can essentially cripple the Ledger device, since Ledger Live can no longer access or interact with the device, leaving your funds in limbo.

Luckily, fixing the error is unlikely to be caused by faulty hardware, while fixing the issue should take no more than a few minutes using one of three main methods described below.

Method 1: Close Competing Programs

Make sure to update your “Ledger Live” App from here:

The first way to resolve this issue to close any other apps that may be trying to read your Ledger Nano S at the same time. This can include any Ledger compatible wallet software, plugins and web apps, as well as multiple instances of the Ledger Live software.

Once all of these are closed, simply re-open Ledger Live again and see if the problem persists. Odds are, closing all competing programs will then allow Ledger Live to connect your wallet, and will be able to read data again. As you can see in the below example, trying to access the Ledger with Ark Desktop Wallet open will produce the error, and can be resolved by closing the competing wallet software while you use Ledger Live.

Method 2: Restart Your Computer (Full Restart)

Sometimes closer an app still doesn’t solve the issue, because some background processes are still interrupting the connecting between Ledger Live and your device. If this is the case, you will need to perform a full restart on your computer, which should close any background processes in doing so.

Often, simply selecting the restart option on Windows or MacOS computers does not truly lead to a full restart, since many computers nowadays offer what is known as a ‘quick restart’ feature. Unfortunately, this can mean that after ‘quick restarting’ these processes are still actually running, since it is not a full restart.

To ensure you are truly restarting your computer, we recommend shutting it down, and disconnecting the power cord for 10 seconds before plugging it back in and turning your computer back on. After resting your computer, Ledger Live should now be able to connect to your Ledger device.

Method 3: Try Another USB Cable

Like most mobile devices, the Ledger Nano S uses a specific type of micro-USB cable that is capable of both supplying power and transmitting data to and from the device.

Unfortunately, telling the difference between a power only micro-USB cable, and one that facilitates data transfer is not an easy task, requiring you to test for resistance using a device known as a multimeter. However, rather than going through the hassle of purchasing a multimeter, it will likely be a simpler job just to try out another cable and see if the error still presents.

Image result for ledger nano s usb

Ideally, you would use the official cable that is supplied with your Ledger Nano S, but almost any micro-USB cable should work, particularly if it was supplied with a mobile phone. If you do not have a cable, you will be purchase a replacement directly from Ledger here.

If none of these solutions fixed your issue, we recommend reaching out to the Ledger Support team to run through the full troubleshooting steps, as there is a chance that your device may be faulty. 

Image credits: Ledger

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