Lonsdor K518 "Device Fault 20" Solution | Lonsdor Auto Key Programmer Tech Support

Here is the working solution to Lonsdor K518ISE/K518S “device fault 20” problem.

Download Lonsdor K518 APK and Manual Install it.

How to Install Lonsdor K518 APK Manually?

Step 1: Download the apk file, copy and paste it to the computer.

Step 2: Connect the computer to the k518 machine with a USB cable, and you will see the K518 device in the file management system of the computer, as shown in the figure below:

Step 3: Copy the apk file into the directory: “This Computer\K518\Internal storage\Pictures”.

Step 4: After the k518 machine is turned on, press and hold the set key and the return key in the red box in the figure below for a few seconds at the same time.

Step 5: After the following interface appears, click the “uninstall apk” button in the red box and wait for a few seconds.

Step 6: The interface appears as follows, click the “OK” button.

Step 7: The interface appears as follows, click the Quit button in the red box.

Step 8: The interface appears as follows, click Repair

Step 9: The interface appears as follows, press OK

Step 10: The interface appears as follows, select Android desktop

Step 11: The interface appears as follows, click the button in the red box.

Step 12: The interface appears as follows, click File Manager folder

Step 13: After entering the File Manager, find the directory marked in the red box in the figure below, find the k518.apk file, and click the k518app.apk file.

Step 14: The interface presents the following interface, click on Settings

Step 15: The interface appears as follows, find the small box behind the Unknown sources item indicated by the red arrow, and click to mark it as selected.